Well , depending on yer definition of 'custom' , here's a few that are definately not stock and modified by me to my liking.
My Ruger Blackhawk with stainless Super Blackhawk grip frame and superb action/trigger job. It's got a Millet rear sight since this pic was taken.
My Colt Mk.IV Ser.70 , done up in typical late 70s disco or IPSC-style. Millett sights , Videcki trigger , Kart barrel , stippled frame front , ring hammer , beavertail grip safety , lowered ejection port , extended ejector , f/l guide rod , beveled mag well , trigger job , etc.
Nitex finish (looks so like stainless), diamond rosewoods , Officers ACP grip safety , Bar-Sto barrel and higher sights are all this Commander got since it left the factory. It had ambi-safety , but I hate them.