I find that the teenagers are left out too so I am inclined to make them, one of my favourite quicky ones are to scour the Charity shops, I know quite a few ladies who work in them and they give me the heads up, and I buy all the football themed duvets.
I then split them in two, layer with batting and a fun backing and quilt, the boys love them. It works the same for girls with the right duvets.