I bury the heads I take that I find interesting. The skinning, boiling then pressure washing (during which I cover myself and everything around me with inordinate amounts of gore) drove me mad - and my wife when she'd find the patio table covered in millions of specs of deer oomsk.
I bury the heads in normal soil for about 3-4 months (quicker in the summer) and then remove, wash off and that's it. I always leave the antlers sticking out of the soil as it helps me find the blighters later on. Anyway, I quite like the brownish patina that develops. I've bleached a few but prefer the 'natural' look. The antler colour usually stays the same. Occasionally I forget how long a head has been in there and dig it up early at which point it looks like something from The Walking Dead....