RE: Bow Practice Games
You could try small balloon's , just inflate them and tie them to your target face.
You can make the balloons as small or large as you like but the smaller the better.
You could also use a deck of playing cards , using just the numbered card's 2 thru 10 and aim for one of the club's , spade's , heart's or diamond's.
Check out Lady Forge's thread on exploding targets in the HNI Hunting Camp Forums , those were great.