What I learned from stitching with a 4 year old:
Kids can easily cut wonky shapes. If I can do it, I shall try to cut with my left hand. Or blind folded!
The end product always goes home to mom for display on the refrigerator
Color. Lots of bold bright color makes any art project better.
Don't take too long. Little boys have a short attention span.
Kids always want to do what you are doing. No room for just watching.
Always end a project with excitement and a crazy leap over the sofa.