My personal favorites are the first two images, but I thought the third would add a chuckle (not to mention uber-original). The others are very good logo-wise. Only three colors, compact, vector, and simple.
There's my pitch. LOL
I'm sure I'll have more before the my sister's birthday(Friday the 13th!!).
EDIT: Sorry about the size, I made them on a 1000X1000 pixel canvas in Illustrator.