It was done in Photoshop. And its for t-shirts that i print myself, so it cant be very detailed. I actually sell alot of shirts and hats and stuff at shows, most people that buy them dont care who or what "Krist Kustoms" does, they just buy it if its a neat looking shirt.
Cool logo, and would certainly make a neat looking shirt. You might end up adjusting for looks/brand, etc. -- but it's the concept that's cool to begin with. Sharp and subtle, and it's "neutral" enough to fit in with the styles of young and old people.