Take a picture of your kiddo WITH their piece of art.
By taking a photo of my child with his art, I can see little Mr. Plane Designer growing WITH his artwork. Then I might be able to get away with throwing away a few of the originals (I'll keep a few choice pieces)! Of course, now I'll have to come up with a way to organize all those digital photos...
My mom always wrote the date and my age on my artwork...so this is kind of like a new-fangled version of that timeless tradition (thanks, Mom!).
E., age 4, mulitimedia collage