I haven't with shoe polish like you're supposed to. I have with home made ebonizer that works moderately well (saturate vinegar with steel wool until it's a nice shite-brown colour). It darkens it, but if you don't wipe it down with some ammonia, your fretboard will dry out a bit too much. Burned the neck since then so no pics, sorry.
Quote by Ippon
available at equestrian/horse shops or online.

Roses are red
Violets are blue
Omae wa mou

Quote by Axelfox
I poste nearly the same thing some time ago, will try to find the thread.

There some info there, but if you are in the US there is this:
Last edited by n1ckn1ce at Mar 31, 2012,