Not sure if this is feasible (because I don't know where your party will be),
but at my daughter's college graduation party some years ago I made jello
shots in every color of the rainbow (every color that jello had anyway). The
party was a Hawiian luau theme, so it went well. You can make the shots as
weak or as strong as you like (I made them on the weak side, as people tend to
go overboard with them). Just replace some of the water with vodka. You
could probably fool around with Apple or Grape puckers. Put them in the clear
little soufle type cups and they look very pretty on a tray. The other thing
we did was make pina coladas. We got the paper umbrellas at the paper outlet
and they were very festive.