I have found the procrastination tool to end all procrastination tools. If you have any inclinations towards drawing and find that you just aren't spending quite enough time procrastinating, come over to Animekaki, an oekaki site themed around anime fanart, and draw yourself some Sabers and Mios and whatnot. Hell, I think I'm going to do sketches based on all the cool anime PVCs I can't afford to buy.
When I first heard about web-based drawing tools years ago, I didn't really see the point; after all, if I wanted to draw and paint, I had plenty of tools available to do that entirely on my own. I didn't need to use someone else's program, complete with limitations. However, left to my own devices, I never think "Hmm, maybe I'll do a headshot of Saber from Fate/stay night"; the limitations of the format just make me think differently. I may not produce anything high-quality, but that's not really the point- it's about letting go of all the expectations you have whenever you're armed with your full palette of tools, and just having some fun in an art playground.
And yes, I did in effect post TWO drawings of Saber on Japanator within a 24-hour period; Is drawing excessive fanart one of the telltale signs of the onset of a girl crush?