If you have small eyes or just want bigger, brighter eyes get yourself white eyeliner.
You don't have to spend a lot, NYC or Wet & Wild brand will do.
Put eye shadow on as you normally would, but before you add your normal liner put white eyeliner on your upper lid only. Then put your normal eyeliner on over the white, but make sure not to cover all of it.
This will make your eyes look bigger and brighter than they already do.