This is like Holly Hobby on crack:
I found my grandma's stash of embroidery on gingham patterns. They were hiding with my cross stitching stuff. This was an article from the June, 1979 issue of Better Homes and Gardens.
The patterns they included were very simple geometrics:
Even better is the 1962 McCall's booklet, "Cross Stitch on Gingham":
This one has good simple patterns I'll share with you tomorrow.