I wanted to know how it looked with a different colour, so I used blue on the white areas . . .
. . . and blue on the red areas for a different look.
The last thing I tried was a square set on it's point. First I did the white parts on the red areas.
Then I filled the white areas with red to complete the square. I think it looks good.
I made these ATC's for a purple swap a few days before the start of stitch explorer. I used fabric with shapes of diamonds. The top one is done in chicken scratch, the bottom one in trellis. You can take a closer look at them here.