My bid card way back in 1996 at Ole Miss was a computer print out on an index size piece of paper. It said: Congratulations <insert name> Alpha Omicron Pi. I still have it!
Today at Ole Miss, all of the sororities use the pretty bid cards with their seal/crest/flower on them. They are very pretty and much more special I think than a print out from a computer!
You can see the AOII Ole Miss bid day card at the bottom of their website:
http://www.olemiss.edu/orgs/alphaomi...cruitment.html
Small pic but you get the idea.