Though you didn't say what kind of grips you are looking for, below are a few suggestions. Most of these grips are wood or special laminates--in other words, not rubber or polymer.
Hogue offers a very nice selection of exotic woods and an unconventional-looking (if that's your thing) camoflage laminate called Lamo Camo. They are available smooth or checkered.http://www.hogueinc.com/getgrip/merchant.ihtml?id=30&step=2.