I don't have a laptop either. I might have found a small desktop but it wouldn't have had Windows. It would be too slow.
I wonder if now kids are using Raspberry Pi at school, Windows is the best option as they are equally(?) likely to have Android or an Apple device at home. There was a very interesting first release of the Raspberry Pi Pixel environment for old PCs recently. Has anyone tried it yet? It sounds ideal for these kind of re-cycling schemes.