For you bowling pin fans, take 5 bowling pins and cut the heads off. Then line the pins up (with heads resting on the bodies) 3 in the back and 2 in the front. Now set back to the 50 yard line and try to shoot the heads off all of them before cleaning off any bodies. A clean run is 10 shots. It's difficult because you need to hit them so they don't take out any of the others.
This is the one shooting game I saw on "Top Shot" that I could actually use at my range.
I take the little stakes with flags for marking your yard and such and tie balloons to them. It's a bit of prep work, but if you funnel in some flour before you blow them up it makes a nice lil "poof" when hit.