This is the design for my Marmoleum "rug"/ floor cloth. I made this design with Excel borders.
I ran an Excel macro that sets up a square grid. I used format borders to put in the design lines and the color bucket for color. Once I had a few squares done, I used the copy format tool to duplicate the design to other squares.
Then I copied the design into Paint and saved it as a JPG file. I rotated the JPG file 45 degrees and "warmed" the JPG to change the colors a little. .... the color is close to what I want.