Just going to write one more post before my flight, sorry for the abruptness. For the next release we want to have swarms of bacteria, and we currently don't have any models for them at all. Having 5 different bacteria "species" with a couple variants of each one would be great. You have complete artistic freedom in choosing the design, shape, and texture (though I think your disney/cartoony style would work perfectly).
If you have any questions, I'll try my best to get back to you as soon as I can, but as Oliveriver mentioned, I'm about to embark on a gruesome 17 hour flight.
Hope you have fun!