I have just today, proudly relic-ed a bass. Not to be styling, but because I was just uninspired on how to finish the bass off, other than to leave it looking road worn and put away wet.
The victim: Carvin acoustic 5 stringer, yellow/ tobacco sunburst. I got it dirt cheap, it was barely played, had a few nicks from past clumsies. I hated the bridge(wood, straight bridge saddle. I hated the frets. I hated the lack of fret markers...just need an occasional glance at the dots ya know, getting old(me). Anywhoooo, found new Musicman metal bridge with correct spacing('bay, $8 !) that fits nicely, pulled the frets, filled with maple strips and repeatedly soaked the fretboard and strips with the thin Super glue until it wouldn't take no more. Had already done the fret markers previously. Sounds fantastic as a fretless - I made a slight depression under bridge running from side to side, laid the piezo in it and covered it with a piece of .020" maple veneer. So the piezo is pressed, but not crushed.
So the finish on the front is just shot. So I enhanced the wear by sticking a piece of 220 fretboard sanding paper to the palm of my hand/wrist where it would naturally rub, ditto on where thumb would rest on body. And some creative volume control wear. I also did some razor blading, some torch spotting, beat it with a handful of old wristwatches(seriously, I do watch repair for day job). And some swipes with finish remover/restorer(Formbys).
I'll pull all the body hardware and pots off next and smooth sand and lightly lacquer, mainly to seal wood. The bass I don't have to worry about scratching - I like it!! GOtta find me some really crusty old chicken-head knobs or such. And I will sandblast and nickel-plate the bridge "badly", intentinally pitting it and then sealing with clear jeweler's laquer...I have the equipment already for that.