Sweet Tooth Fairies with Braces and Scaffolding that start and finish with the same word. (An original idea flown in by grantbarrett over at wordnik).
Some looping ones, where they can be as long as you like, they have to end on the same word they start with, they can’t have repeats, and you can split one-word compounds into two words (since we usually do it aloud) and even better if they seem to allude to a story.
Posted as the end words of these STFairies. Following them will take you full circle. Hah!