Based on this question, it looks like we might want to have some discussion about the design for the site after moving from beta. I thought I'd take a stab at some ideas for the favicon, that little logo that goes next to the questions on the right side of the page. I saw that most of the favicons are boring. In response I made this image, note I am not a designer and the 16 by 16 pixel limit makes it hard for me to make something actually look like what it is.
I have a DNA double helix, a Beta sheet, an alpha helix, and red blood cell. The blood cell is the only one that looks decent from a distance.