I'm not sure two 10 year olds are going to appreciate the effort, lol.
One of the Twins is getting 2 pairs of earrings, the other is getting a home-made voucher for a sewing class or workshop of her choice. I folded the voucher up and put it in a small box, but it looked a bit sad, especially considering Twin S has 2 boxes to open.
I had a brainwave, and went off in search of a little Origami book I'd found whilst excavating the bookshelves. Thanks to my reorganisation, I found the book straight away.
It's now in the "charity shop" box, as the instructions weren't detailed enough for a klutz like me.
Google, as my online friend Sybil might say, is my friend. I searched for "easy origami" (coincidentally the title of the rejected book) and found quite a few allegedly easy pieces. I chose a crown. My first go worked well, but the resulting crown was too big for the box. I quickly re-did the voucher so that I could cut the paper smaller, and my second attempt was just about right. (Just in case you want to have a go, the instructions are here
I packed it all up before I thought of photographing it, so here is a pic of the too-large version.
Again, I'm not sure that a 10 year old would particularly appreciate the thought behind it. Her mum might.