Trash or Treasure? I can't save it all!

Calling all moms! What do you do with all of your kid's art work and school work? Since my daughter started pre-K last fall I am accumulating so many school papers and art projects, doodles, crafts... I could wallpaper her room in the amount of paper I'm saving. Some are masterpieces and others are... well... let's just say I'm saving those because I'm a conservationist. But the inner voice that wants to break the hoarder tendencies that run in my family says, "RECYCLE!" How do you determine what or how much to keep for posterity? I mean, I have to draw the line somewhere, she has another 13 years of school ahead of her. HELP!