Summer Reading programs?

I used to do a summer reading program each year - but I've missed the last couple of years. We have a lot of new families this year so I'm going to give it another shot. Any ideas for themes? I've used "Hop into Reading" with a frog; "Wolfin' down books" with a wolf; "Paws-itive summer reading" with all kinds of animals; "Bloomin' with books" with a flower theme; and some kind of racing theme with the tortoise and rabbit that I can't remember the title of...

"The World is Your Library," with an international theme? "Reading on the Milky Way," with a sun, moon and stars theme? I think my titles could be improved, I'm just trying to think of visual ideas to work with.