I like the filet knife most.. seems hard to find a nice trout sized knife. I got a large Rapala years back with scrimshaw bone bolsters, and a piece of birch. I think they called it the witches tooth.
I normally carry the smaller rapala felt knife, and the most I could do, was to use my gas torch and wet rags to lightly burn the handle here and there, then staining it for a tiger stripe appearance. I dipped it in some sort of outdoor urethane about 3 times, scuffing it up tween coats with steel wool. It came out OK, but not nearly the craftsman work you have.