Horse- Decide a sequential order for each player to take a turn, and the first player takes any shot he pleases. If he makes it, the next person (as decided by the sequential order) has to duplicate and make the shot. If he misses, he gets a letter. If he makes it, the next person must make and duplicate, and so on. If you miss one shot another person made, you get a letter (H), and so on until you spell "Horse." If you do, you're out and now it's down to the remaining players.
Some people like to make it so if everyone else makes the first person's shot, he gets a letter, but I don't. You can fi you want, though, I guess.
Also, if everyone makes the first person's shot, the order starts over and he makes up a new shot.
Outscore Me- Simple. You try to score as many points as possible in an alloted amount of time (maybe until the game loads?) and outscore your opponent.
You can use these to decide who gets to be Home, or whose settings to use (my friends and I argue over the camera all the time) or other things, or just for fun.
Anyone have other suggestions for things to do with 2+ people in the 360 practice court?