I've been in the process for ages of curating, and redrawing my pattern reference folder - it's something I do on and off when I'm in the mood (more off than on - I'm only up to the D's). I initially drew out patterns that I liked quickly and in basic format, now I'm going back and being a bit more adventurous with them, randomising, adding shading, etc, etc. It's a great way to revisit ones I have forgotten, put my brain in neutral, and get the odd idea, too.
When drawing out Dawn's lovely pattern Blossom - the zig zag grid got me thinking, the end result was this pattern:
I had some fun experimenting with the fill options:
If filling with black as above, you could ditch the initial horizontal lines and just do rows of zig zags.