These links are for 41Magnum and Sack Peterson. Others who frequent here include CaryC and I know there's one or two more but can't come up with their names at the moment.
I have a set of Altamont grips for my Beretta Tomcat I like a lot and also considering a pair for my brand new GP100 Match Champion (prefer vs furnished Hogue® Stippled Hardwood). I'm not certain but do believe Altamont is the OEM supplier of grips to Ruger for the limited run GP100 Wiley Clapp models. http://www.altamontco.com/experimental/products/pistol/ruger/#Ruger_blackhawk.php
we too like the Altamonts, and there are Ajax, Hogues, Eagles...........
LOTS of them out there, and subject ONLY to how much you want or are willing to spend on the 'type', look and material that floats YOUR boat!!
Those are some great looking grips guys. A lot of the websites I was finding seemed to have a ton of White grips which I'm not digging to much right now. Those companies open up a ridiculous amount of options now.
Those Elk grips look awesome. I could definitely get into those over a pair of plastic white grips. The bluing on your Python is pretty incredible too. I just saw a Python snubby and an Anaconda at a local gun shop yesterday. WOW! have they increased in value over the years!
Second vote on Patrick Grashorn, also Sac Peterson for elk antler as well. Both are true artisans. I've got a couple pairs from both and they look right and feel right in the hand.
This fella gets my vote!!!...I'll get some pics of the last set of walnuts he did for my Bisley 44 Spl...superb job and most importanly he has a profile that fits your hand well with a flat bottomed cut.