I was surfing around on
www.webshots.com (it is kind of like
www.corbis.com, with free photos). I typed in "sorority" to see what kind of photos they had in their database. There were about 74 matches. They appear to be predominantly the NPHC sororities - I saw pics for AKA, Zeta Phi Beta and Delta Sigma Theta (I am not in an NPHC myself.)
So I thought some of your ladies might have an interest in the photos for your group, if you wanted to make a screensaver or desktop wallpaper or something. (alas, I did not see any for Sigma Gamma Rho). Enjoy!