There’s lots of these, so if this one changes / goes down, do a new search: PixilArt
With this online free app, you can customize the colors for features and text on Google Maps. You don’t need to sign in to try it out, but if you come up with something you want to save, you will have to sign up at that time (and it will save — you don’t need to make it again).
The signup is just name and email.
“You’ve used keywords to search for images, but have you used color?
With Splash, you can now browse a subset of the 500px Marketplace by getting creative with color,” is the line offering the app 500px’s online service.
Users simply go to the webpage, select a color and spraypaint it or draw it onto a blank canvas, and the app finds similar pictures in real time — yes, real time. As you draw, the app will update its similar picture results.