Non Alcoholic Cocktails

Non-alcoholic "cocktails" of 12 years old kids?
My niece is throwing a small gathering for friends and ask some non-alcoholic "cocktails" that can do for your meeting … "Just to feel a little" adult "!" says ….. * Sigh * teenagers these days …. Anyway, sensible and helpful answers appreciated!
All http://www.floras-hideout.com/drrecipes/non-alco-Classic.html these recipes are without alcohol. Personally, I like the pina colada.
Inspired Sips – How to Make Non Alcoholic Cocktails