Extremely useful--you can do your own pattern within the Punchinella grids, or do them straight on as background to a project. Extremely handy.
If you are an art journaler, you know using punchinella to create backgrounds is the rage. This was such a great idea - 3 different strips of punchinella in one template. I now have to get the 6x6 size of this.
This template is great because it give you three designs within one template. I've used it with Glimmer Mists, but can also imagine using it with inks and paint. Four stars because I wish these templates didn't cost so much -- seems like a lot for a small bit of plastic.