I've always liked smooth ti on the side of the knife that rubs the pocket, on pocket clip equipped knives I mean. That is what makes them among the kindest to pockets IMO. With that said though I do like having a bit of a grip or texture about where I place my thumb when I'm trying to pull my knife out to use it, so on some of my own I've placed a small textured overscale of G10 or leather I impregnated with grip texture. This gives your thumb a bit better purchase of the handle to pull it out and it also aids in grip when using the knife some too so I've had some success just doing something simple like that. (see pic of two of my He-Man model knives closed) Then you could just get a die cutter and a dremmel and go to town on it. That can make them look pretty good and so can a small wheel attachment, a fine grained new belt and some free hand art work done on a grinder for that matter. See the little southpaw folder I did for my friend Jon years back.
STR