Tonight I made 2 x 15 inch square design boards following this tutorial by Lori Holt of Bee in my Bonnet. I made this size because it was the largest I could cut out of the piece of foam core board I could buy.
Following some advice from a fb group I used 2 inch wide duct tape, instead of the fabric edging - it was much quicker, neater and safer too!
I was so happy to have just enough of my favourite duct tape from Daiso to do the job. I usually use this on my swap packages but I was sad it was going to run out, now I can see it all the time