Here are a couple of techniques/games i've found benficial on the driving range:
1. If hitting wedges at the 50 or 100 yard signs, try aiming for the individual digits, as opposed to the target itself. Helps your mind focus on a more precise target.
2. Take a particular club and hit a straight shot, a draw and a fade. Then a high straight one, high draw and a high fade. Then a low straight one, low draw and a low fade. If you do not execute any of the shots to a satisfactory level (depending on your level), start from the beginning.
3. Play imaginary holes on your home course. (Try and choose holes which you find tough or generally tend to struggle with.) This is a good exercise for visualisation and can also be used prior to a competitive round. (As part of your warm up, play the first hole that you wil play on the course. )
4. Only hit one shot with each club. I sometimes find that I get caught up in hitting too many wedges, or 6 irons or drivers at the range. By switching club every shot, it keeps your mind fresh, forces you to pick new targets and more accurately simulates an actual round