Giantmicrobes.com has a pretty decent set of categories for their products - I like the organization. Also, they have started producing specialized human cells and small multicellular pests. Blog with educational suggestions: http://www.stemmom.org/2012/04/giant-menacing-microbes.html
Keep one of these Gigantic Plush Microbes on your desktop to remind yourself that there is an "invisible" universe out there filled with very small things that can do incredible damage to much bigger things.
There is truly no better way to show off your awesome appreciation for science, geekery, and bacteria than with your very own plush microbe! The overwhelming cuteness of Escherichia coli is sure to compliment any room, office, or workspace without the painful pathogenic reality of the real thing. Makes a great gift for friend and foe alike.