The Jay Scotts can be found without the wood backing [or is it "fronting"?]. Go search the gun auctions.
The wood backing can be ground down to remove some, or maybe all, of it and then one can get a more "accurate" appearance of a faux pearl, ivory, or stag. However that depends on the gun's frame dimensions and the specific fit of the grip to that particular gun.
I think the stags, pearls, and ivory look good enough for a run-of-the-mill-gun although they do not replicate the real materials accurately.
They can be picked up very cheaply at the gun shows, gun shop grip bins, and garage sales.