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
Infectuously Cute Plush Microbes! Most folks never realize how cute microbes can be when expanded 1,000,000 times and then fashioned into cuddly plush. Until now, that is. Keep one 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. Then go and wash your hands. Lather, rinse, repeat.