Looking for photos of microscopic pond life

[Will Peacock]

I'm a researcher working on the design of an educational exhibit in
Vancouver British Columbia, Canada, and we are looking for microscopic
photos of pond life. Ideally, we are looking for a single shot that
gives visitors an idea of the teeming life in a drop of pond water.
I.e., a range of species: spirogyra, water fleas, amoebas, etc.

Can you help us? We do have a budget to purchase images, if they are 
available.
If you can help contact me at:

wpeacock at unix.infoserve.net (Will Peacock)