Need quick and easy food ideas for a party?

I'm hosting a make-up party tomorrow evening for 4-6 people. I'd like to have a couple appetizers or possibly dessert. It has to be something that I can either prepare tonight and keep until tomorrow or prepare in about an hour after I get off work tomorrow. I'd also like if they were at least somewhat healthy... several of the guests and myself are dieting and I don't want to ruin that.