There are some really terrific and amazing Processing projects. I think some were a part of an unrelated posting here a while back about cool online graphics toys.
A friend of mine has been really into this for some time now. He first showed it to me a year or two ago. This reminds me there are probably a lot of cool things like this that I know and might be of interest here but that I never post. I'll have to dig through my bookmarks more and find some gems.