That is a neat idea!

There is no end to the resourcefulness of folks on the board....

Oh, I did see several diced and tartan socks for sale on various merchants' websites. The diced ones are much less expensive, and the tartan ones (actually argylle, the patterns were more diamond than square) were much more expensive, as it seems they are more 'made to order'.

Red/white and red/black diced are fairly common....