Depends on the racquet. If you have Head or Volkl, you can change the pallets.
If you don't, you can try removing the grip and using some over grips or you can find a extremely thin replacement grip...I think it's called ResiThin that's one of the thinnest.
Bullfan, "Bull rap, there is video evidence." and "Dude it's on the Internet, and hasn't been hidden."