What size squares?

[Sylvia H]

It's for your walking foot and measures how far apart you want to stitch.

https://www.youtube.com/watch?v=2ct3G0Nh-pw

Ah! I have three of them, but didn't know what they were called.

[Oleg]

Sidetrack! I'm thinking that would look really cool if another row where added (and perhaps another column) to make a rainbow (reds on the first, orange on the 2nd, etc.) using different tone on tone fabrics, keeping the pattern of breaking down the blocks as you go. Or maybe it could be reversed in a mirror image on the diagonal? I really like this, it has the wheels turning in my head!

[Kajenkids]

I'd guess at least 15". Maybe 16". Cool concept!

[kaydee]

Based on the size of the clothes pins, I'd say the largest block is either 10 (finished) if those are 3" pins, or 12 (finished) if those are 3.5" pins. They look like longer pins, so I'd guess the largest block is 12" (finished).

[Hulamoon]

I'd guess at least 15". Maybe 16". Cool concept!

I like 15 finished. That's a good size.

[Kajenkids]

I like your thinking Lorie!