Here at our school the children all are In Art class and they draw a picture. Then it's sent home with Arts by me and we can order a magnet or whatever. I think if you made them give them fabric markers to draw their picture on it. It will be awesome and very special to the mothers at least to me it would be. I would be grateful for the work you put into it and then the children draw on. It will make children feel they did make it no different in them drawing and sent away to be put on a magnet, poster, cup apron. It's just you doing the work. So go for it.