These are lots of fun to make and so easy. Do a search for Criss Cross Coasters and you will find several tutorials. I'd leave a link here, but that implies I know how to do that...and that I do not know how to do.
I made a whole bunch a while back ago and gave them all away. I love how colorful they are. I ended up not using any interfacing because I like the corners to be a bit more crisp and I think they are quite substantial without the extra weight.
The instructions call for using charm packs which I had on hand, but of course you can chop chop with the scissors and forget the charm pack.
Hoping all of you are having a stellar weekend.
p.s. we got a bit of rain last night without the added drama of electricity in the air. your good thoughts made it happen, that's for certain.