I think you'd get a lot of romantic stuff with light. Imagine couples viewing light that's passed through both of their bodies, or a picture of a beautiful sunset visible through a couple holding eachother.
As for games:
Courtlight is played with at least one light source, an object that can cast a shadow, and at least 3 players. At least two objects are placed as goals in the shadowed area. The object of Courtlight is to redirect light from the source into your goal, and to redirect light away from the opponent's goal.
Courtlight games can be extremely varied. Street games usually involve the sun and a house. Professional games generally use artificial lights of varied colors, and usually require combinations of colors to score. Most involve at least 3 teams simultaneously playing, with each team sharing only one common color with other temas. For example you might have Red, Blue and Yellow lights, and one team scores with Purple, one with Green, and one with Orange.
The only rule all Courtlight games share that hasn't been stated yet is that players must be constantly moving. This rule is sometimes modified for handicapped players, but is never entirely ignored. It is common for Courtlight to use zones that players are not allowed to leave, but some games do not have zones and even allow for physical contact.
Variations of Courtlight exist that use human players on teams as mobile light blockers.