There are many different cook books on dump cakes and even dump meals! I have a few and like them, but not all things can be successful just dumped. Keep that in mind before you go experimenting.
The cakes are great though. I like to add nuts to them as well.
I mean to add that I put the nuts in the cake mix top, so they are on the top with some crunch!!! I like blueberry and pineapple with a yellow cake mix or cherry and pineapple with yellow cake mix. I bet a pineapple and key lime cake mix would be good or a white cake mix with peaches!