Just for fun, I tried a halftone effect in Photoshop to give it that old-timey four-color comic book coloring effect (using the tutorial here: [link]
I had to convert the file into CMYK to get the proper effect, but I forgot to convert the file back into an RGB format once I was done. Consequently, it wasn't showing up in most web browsers (Cue a Homer Simpson "D'oh!" here). Lesson learned: ALWAYS convert your file back into RGB for the web!
This is the fixed version, converted back into a web-friendly RGB. Hope you like it!