I have never seen any Phi Mu's using any time of handsign, but then again making a quatrefoil (our symbol) or a lion (our mascot) would probably be pretty difficult to do. If anyone out there is clever enough to figure out something, I'd love to see it.
I always thought the ADPi's diamond that the girls make with their hands was the cutest thing on earth and am jealous we don't have something similar!