I'll give you some prompts from each fandom that we share, just so you get a variety.

Lost; Shannon; crystal, invisible stain, white tablecloth
Lost; Aaron/Clementine; paper cut, lighter
Lost; Kate/Cass or Kate/Sun; gasoline, Iowa border, payphone
GA; Alex/Meredith; pep talk
GA; Lexie/Meredith; crayons
BSG; Kara; "tell me what my hands were made for/tell me who my mouth was made for"