by the way, ours was 25$ a person ( i went with my (new) boyfriend). We didn't have an open bar, so u still had to pay for your drinks but it was cool coz the bartender didn't card--not even me, and i look 18 but im 20--anyway about favors i think i like last year's the best, we had one of those pewter cover photo albums with our letters engraved on it, and the cover is like a picture frame, and then of course you can store your other pictures inside coz its an album...i liked it only coz i think glassware is too overdone!
For Spring Fling earlier this year (a non formal, themed dance) we had a Hawaiian theme and so our favor was a white pillowcase and it had our letters on it with palm trees, and it said "WEt dreams in a Hawaiian paradise 2001"