I bought a Digital Blue Microscope at Blacks Cameras for $50 today. It's a toy with many limitations but it can make some interesting pictures at maginfications of 10x. 60x, or 200x (so far I haven't been able to do much with the 200x--lighting is a problem). I just played with a little with the following results.
a penny at 60x
piece of onion at 60x
Not great but it could be interesting.