I've wondered the same thing. I've never seen anything using them--just like those helmets.

I haven't used the celtic knot designs! I'm not sure may be a table linen??? Good question.

Welcome to the Cute family. You can use celtic designs on any item you choose. Some can be used as border designs on quilts, tablecloths or runners, placemats, coasters for the individual designs. They can be used on tote bags, cushions, the border on top sheets. Well, you get the idea. Have fun and experiment. You are the artist.