I bake, so my guy always gets homemade goodies. I also try to make enough for the entire shop (somethings he just refuses to share, so I make seperate plates). They get to be my taste testers and I have a grateful artist. ;-) We were friends before he ever started working on me, so that's always nice.
Aside from that, I always make sure I'm well rested, in a good mood, well-hydrated, freshly showered (you're gonna have someone all up on ya for a good length of time, it's only polite.), no perfume and ready to sit! I show up on time (even a few minutes early so I can get situated), say hi to everyone who works in the shop, not just my guy. We have a great time and joke around, makes the time pass. It's a good shop with a fun bunch of people ---why fuck that up by acting like and ass? Be nice to the people who are tattooing you...they are doing something amazing for and to you.