These are incredible.
You might want to check out shutterstock.com. It's an on-line marketing house (the biggest one on line) where you can upload your images and make a small amount every time someone downloads your image. I think it starts at only $.25 cents per download, but you get more as you make more. There are also expanded licenses buyers can pay that will make you more (up to $28.00/download). It doesn't sound like much, but it adds up and each image can be resold over and over again. I get a payout every month ($75 minimum payout) and my best selling image has earned $2000 over the last 4 years! Once you've uploaded it, you do nothing else (except upload more!). It's free to you and they LOVE vector images!
Check it out - and if you decide to sign up, use this referral link: Shutterstock :: Make money with your photos!
If you're interested, let me know - there are other stock agencies that have vector art and I'd love to send you referral links for those as well!