Clean up your own mess, and have fun shooting whatever makes you happy.
I like to shoot toys with the kids:
http://www.thehighroad.org/showthread.php?t=68687
And destroy United States currency:
http://www.thehighroad.org/showthread.php?t=76674
And vegetables (well, wouldn't
you rather shoot your broccoli than eat it?)
http://www.corneredcat.com/Kids/momkids.aspx
We've shot water balloons (a hoot!), air-filled balloons, balloons with flour in them, toys, coins, golf balls (no visible holes btw, they self-heal with a .22 at any rate), milk jugs, pop cans both full and empty, and upon one memorable occasion, a TV.
When we shot the TV, I put a huge tarp down around it. After the splat, we just grabbed the corners of the tarp, pulled them together, and properly disposed of the whole mess, leaving no glass behind at all.
Lots of fun to be had at the range with reactive targets, if you just know how.
Clean up after yourself!
pax