I place my dice out on the table, seperating them into their various types of dice, with the high number up. I tend to rotate which dice I use, depending upon how the last group I picked up were rolling. Of course, this doesn't help with my d20s. They all hate me. Switching to playing d10 systems has helped me immensely. My d10s like me more.
I also have a dicebag of shame where, once a die goes in, it rarely ever sees the light of day again. I have also previously subscribed to the 'ugly dice roll better cause they want to be loved' mentality. It worked, for a time. Then all of my d20s rebelled.
I am well know at our local tables for h ving horrible dice luck, so I do what I can to try and change that. Also, certain characters seem to have their own luck. My Paladin pretty much never fails a save, but can't roll above a 5 in combat (despite being high level). I've had the horizon walker who could not ever pass a save, but never missed.