I haven't read all of the replies yet but there are so many cute ideas. I can't believe how creative everyone is. Here are my ideas, don't know if they have been said yet
1. A top hat (upsidedown ofcorse, and embellished)
2. Ladybug (every little girl loves ladybugs)
3. tulip, (I think it would be adoreable to see a yorkie curled up inside a tulip
)