Have been fooling around with a oekaki style drawing utility for a series of posts on the Computers Club Drawing Society website. The above montage was screencapped from my Windows 7 image viewer. All of the above drawings have been posted to CCDS except the bottom right one--I deleted it and made changes to it in MSPaint.
The above images are reduced/softened so you don't get the full effect of the old school black and white fill patterns that you get in the originals. It's been interesting to work with a program that's more painterly than I'm used to, though the drawings seem to be going in a cartoon direction.