I have seen laminating machines reasonably cheap in Kmart, and I thought that could be a good idea to laminate, say A4 size, some of the best ones to keep.

I've seen people put their kids' favourite paintings under the glass of a glass-top table, or on a kids' table with contact or transparent plastic sheet taped over, and they are always good to look at.

We have a few paintings my kids have done directly onto canvas hung around the place and a couple in frames.

Those big plastic tubs with lids are good for keeping more bulky favourite items.