Wow, you guys, thanks for all of your answers! I'm new to CD, and I am amazed at how fast people reply. Of course, there's over a million members. Of course, being new, I did a total noobish thing and didn't search. Only until after I posted, I noticed that there were about 5 other threads about this same thing. And, I stupidly didn't read the things in the "read these first" sticky before I made this thread.
But, oh well; there thankfully isn't too much damage done. We were all noobs once.
It seems that most people use the old parts, keep the robots for demonstration purposes, or recycle the metal parts. I like the recycling idea. We don't have a lot of space for our robot(s) at our school, so one of the reasons I made this thread was find out some reasons for getting rid of the parts. Donating, recycling, throwing away.
Any more ideas for our situation would be great, thanks so much.