My father's Model 94 30-30 was a gift from my uncle back in the '50s. My uncle was a graphics artist and did a relief carving of a panther head on the stock, and oak leaves/acorns on the forestock. He then checkered the grip and the other side of the forestock. It was one of a kind, and the carvings were tasteful and very well done. No, it didn't add a nickel to the value of the gun, but it's a keepsake that keeps the memory of both men alive when it comes out of the closet.
Sometimes personalizing a gun works, other times..... not so much.