I started working on a smallish project. According to Eric Keller, every animator has to do a blood cell animation at some point in time, so this is my shot at it. I'm practicing up on some dynamics. The density isn't right yet. I'm not sure how accurate I want to get the biology, since that will probably result in millions upon millions of RBCs. I'll do some calculations, figure out what kind of vessel this will be, and go from there.
The geometry is very simple. I tried to add some randomness to the vessel and the red blood cells. I'm also using procedural textures to see how realistic I can get with ramps and noise.
I haven't touched the lighting yet; that will make a big difference. Eventually I think I'll have a large WBC travelling through and the camera will track on that. Nothing too original, but like I quoted above, everybody's gotta do one ;)