Well my oldest just hit Kinder this year. I'm the opposite of a pack rat though. He he doesn't come home raving about the project, I don't tend to keep it. He's got at least 12 more years of school to go and collect more stuff. I don't feel the need to incorporate it all either. It has its own binder.
I take some picks of some of the stuff he does and scrap those, not the project. I may just be an odd ball here. I'd totally stick with my 12x12's no matter what