I think it is rather mean that Mums refuse to keep their own child's art work and foist it onto grandparents!
I had an under stairs cupboard where I displayed my boys treasures, on the inside. That protected pictures from being destroyed by accident. 
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). Even a 7 year old could see the sense of this. I tried to take the same line with my daughter - praise her effort and made it clear it wasn't any fault of hers that I didn't like or need it. Actually, there were a couple of things of hers that I did keep. One was a prettily covered box, just the right size for filing all those odd recipes I used to cut out of newspapers in pre-internet times. The other wasn't artwork but the life-saving certificate she proudly gained at the swimming club, aged around 8. I had that pinned to my desk for years and only gave it back to her when we moved house last year. She worked really hard for that certificate and I felt humbled that she wanted to give it to me.