Plenty of people today have part-time jobs. Some enjoy a life of variety, cobbling together two or three part-time jobs (versus one full-time job). Others just have a few extra hours to fill so they take on part-time work to make a little extra cash. Still others use their part-time job as a way to learn skills they’ll need to launch their own business or plump up their resume to get the edge on competing applicants. Whatever the reason, here are some neat opportunities where you can earn extra cash—sometimes in very interesting ways!

1. Become a moving billboard with Free Car Media

Renting out the space on your own vehicle is an advertising concept that has been in motion for over a decade now and is still going strong. You can get paid to place ads on your vehicle—sometimes the ads are only placed on the window or rear windshield, while other times the car is fully wrapped in ads. You can choose what kind and how much advertising you accept. Expect to earn from $50+ per month (rear decal only) to $300+ per month (full vehicle wrap) depending on the advertiser you work with and how long the campaign lasts (typical campaigns last a minimum of a few months).

You can sign up for free by providing a name, email, residence information, a contact phone number and some details about your vehicle. From there, you can control which offers you accept from advertisers interested in advertising on your vehicle. There are a lot of different companies that provide this service—Free Car Media is recommended by Bankrate, but you can research to find the one that best fits your payment needs.

2. Tutor online with InstaEDU and Tutor

There are plenty of reputable sites that are seeking online tutors. Session prices can range from a by-minute to a by-hour rate. Other sites may offer course-long tutoring (for a higher price) or prepared lessons students can watch online. As an online tutor, you can expect to earn from $0.40 per minute to $20+ per hour. Two of the most popular online tutoring sites are listed.

Both sites ask you to create an online account to start the application process. Once you have created your account, you can begin applying, specify your subject matter expertise, and learn more about setting your tutoring hours. One of the best things about being an online tutor is that you can be flexible, since online tutors are available seven days a week, 24 hours a day, 365 days a year. There are many other online tutoring sites in addition to InstaEDU and Tutor, so you can browse the web and choose the one that offers the pay and flexibility you’re seeking.

3. Rent yourself out as a friend with RentaFriend

While the idea of renting yourself out to be someone's friend might feel very weird at first, the website has been in operation for some years now and it continues to grow (more than 250 thousand people are currently listed as "friends for rent"). Whether you have a unique skill (such as speaking a second language), are good at showing newcomers around a city, enjoy watching movies or working out at the gym with a partner, or don't mind standing in line to buy someone else's tickets, you could earn extra cash by renting your time out—and here, think platonic friends or a reasonably priced local assistant, not dating.

It’s free to join, and you set your own hourly rate. You work only when you have free time and are able to say yes or no at will. You can also set strict parameters for who can see your profile and contact you. To sign up, you will need to provide your name, geographic location, phone number, an email address and create a password.

4. Take part in a mock trial with eJury and OnlineVerdict

Lawyers spend a lot of time and money attempting to predict how a verdict might fall. Using the Internet in this effort is just the latest in an ongoing tradition of holding "mock trials" with representative randomized "jurors"—and it can earn you anywhere from $5 on up per case you review online.

Both eJury and OnlineVerdict are free to register with—all you need to do to sign up is to provide some basic information (including demographics and geographic location). eJury pays via PayPal and OnlineVerdict pays via check once per month. All you need to do to earn cash is to review an email version of the case facts (prepared by the attorneys) and submit your verdict.

5. Loan what you own with Loanables

Have a leaf blower just sitting around in your garage? Think your dog is a natural star? Not sure what to do with that extra table and chair set from your brother's graduation party? Why not rent out what you own to make some extra cash?

You can sign up for a free account by providing your name, email address, address and zip, and a create a username and password of your choice. Then you can begin listing the items you have available for rent, including a description and rental price. You can choose to get paid with cash, check, PayPal or Square. Loanables also protects users with a loan agreement (which you likely won't find on eBay or Craigslist-type sites).

6. Review new music with SlicethePie

SlicethePie is a website that launched in 2007 to help independent (unsigned) artists and bands gain the exposure and fans they deserve. The name is derived from the intention to reward honest, well-written reviews with a "slice of the pie."

All you need to sign up is to provide your email and a password. Once you confirm your email address, you can start writing reviews. Once you have earned at least $10, you can withdraw the cash into your PayPal account. You can also earn extra cash if you refer friends to SlicethePie and they become reviewers.

7. Chat about products online with MyLikes and PinBooster

Using local influencers (a.k.a. you) to reach prospective customers via trusted media (a.k.a. your social networks) is just the newest effort in a wave of changing advertiser strategies—and it’s a successful one thus far. You can earn legitimate cash promoting content to your friends and colleagues using either site (or both).

Both sites operate in the same basic way for their respective online media. Signing up for each is easy—both sites permit registration via social media, or you can register using your email and a password of your choice. Earning cash is based on supporting certain content to reach a higher visibility to a trusted audience—your social networks.

7 Weird (But Totally Legit) Ways to Earn Some Extra Cash