Garlic! Good idea. I've given DD an onion to play with before... and she bit into it like an apple!
In this heat we're having on the East Coast, I've definitely been letting DD run around diaper free. She has peed on the floor a few time, but mostly we are outside on the deck so no big deal.
Other toys that have worked include anything that belongs to the dog, the remote or a phone, another diaper, or a page from a magazine.