Can anyone recommend a good source for microscopic images of crystals (gems,
minerals, snow, ice, sugar, anything)?

I am taking an advanced design class and one of our projects is to create
a multi-media presentation, less than 3 minutes. I would like to create a
series of progressive images using crystals with New Age synthesizer
music. I am hoping to get access to a microscope/camera setup but I only
have a couple of months so I thought that I'd look for printed or internet
images also.

I would scan/download them and modify them, so hopefully copyright issues
wouldn't be a problem. Plus, its just a class project (not going on
exhibition or making money).

I would appreciate any suggestions!