For my sister's bachelorette party, I'm making jello shots and pretending I'm at least 10 years younger than I actually am!
I'm making these. I've made the lemon drop ones, and they were tasty if a bit tart (they are probably better with the lemon sugar, but I didn't do that). I have the cosmo and margarita ones in the fridge right now. I plan on making the bellini ones later tonight. If I have time, I'll make some more. I'll determine which ones based on a scientific process of taste testing.
They taste a bit more grown up than the artificially-flavored true jello shots. They're really just cocktails with a little unflavored gelatin. So, unless you don't like gelatin, I definitely recommend these!
(I liked the site up above, but here it is if you'd rather cut and paste - http://www.thekitchn.com/5-cocktail-inspired-jello-shots-228091.)