Weeping Angels for me as well. Whats creepier then not knowing if something is coming after you or I not, espc when they look like something we all know. Brillant idea.
@Midnight, theyll be back in series 7.
Edit: Also for people looking for T-shirts, ThinkGeek has a ton
The Angels Have the Phone Box,
Bow Ties Are Cool,
Keep Calm and Don't Blink (my personal fave). There's Adipose plushies, 10's Coat, Harkness's coat. Tons of goodies.