Short and Sweet:
* Two tiny treats, two tiny treats.
* Treat the tree with a treat.
* Treat time, treat time, treat time.
A Bit More Challenging:
* Three thirsty tigers tried to treat themselves to three tasty treats.
* The tricky turtle traded three tiny treats for a treasure trove of treasures.
* Peter Piper picked a peck of pickled peppers. A peck of pickled peppers Peter Piper picked. If Peter Piper picked a peck of pickled peppers, where's the peck of pickled peppers Peter Piper picked? (This one uses "treat" in the rhyme scheme, but it's a classic!)
Let me know if you want more!