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We don't have children around anymore, but we keep a toy box ready to go in a spare room that any little visitors may play with. I have a box of 2x4's that I cut to uniform lengths and sanded the edges. We build forts, houses, stacks, anything their imaginations can come up with. My wife was skeptical, but they are really a big hit with the kids!
Some of the other things I have created include a tractor trailer, helicopter, marionettes, etc.
I made a candle stand with wood out of my scrap wood bin entirely using hand tools. Each piece was rip sawn with a hand saw, hand planed, and flattened all joints were made with a back saw and chisels. All the mortises were made with chisels and a mallet, and there is no metal fasteners used in the construction. My daughter loves it - and it as essentially free.
Other things I turn on the lathe, make pens from scraps of maple, and other hard woods, bottle stoppers, lathe boxes for toothpicks,
i hope this might be what you could use with your scraps.