I'm sure others have ideas too - here's a few to start.
Expand the animal badges into higher numbers - i.e., the highest chicken squeezing badge is for 503 squeezes. Put in the 1009, the 2003, the 5009, the 10,001, the 1,111,111! I could totally squeeze a million chickens. (same for petting pigs, nibbling pigs, massaging butterflies, milking butterflies and so on.)
(I suggest this first off, because it seems like it would be easy code-wise and would help give us higher level players something to do.)