An invitation

As I work with my young pianists on improv and creativity, it would be really helpful to have a store of brief lyrics for them to work with. I could get good mileage out of silly poems suitable for children; 4 to 8 lines, fairly regular in rhythm, but they need not be overly simplistic or "sing-songy". Might be fun to work with limericks! (Church-suitable stuff would also be useful but I'll need to be pickier about words/message there.) Any takers?