There's a plethora of colors and subjects. These are just a few of the ones I've found that I love.
(Click on them to enlarge)
You can download high resolution scans for most of these boldly colored gems. All they need after that is a little bit of Photoshopping and a little bit of love and you can print them out and frame them for some gorgeous and unique wall art.
Go check them out. You're bound to find one (or more!) that you love.