I'm a total sucker for this colorful little burro character from Bird's Party Shop's printable Mexican fiesta design. Wouldn't this be fun for Cinco de Mayo? Check out the rest of the fiesta here. While I was browsing Bird's shop, I found a few more printable party sets I like, including this strawberry party and the Bollywood set (below).
And while it's not quite my cup of tea, they do have a Royal Wedding Viewing Party Collection. Speaking of which, are you planning to watch?