Mum made this table runner when I was little and I remember it from that time.
With variegated thread it is never a dull stitch, and it is surprisingly easy to work even on even weave fabric.
It is made like this:
It looks like this on Aida:
English name: Four Sided Stitch
Swedish name: Myrgång or Kvadratsöm
It is often found in Scandinavian embroidery like Hardanger and Hedebo, but it features in many of my books, so I would say it is an international stitch:
Stitch a border of Four Sided Stitches on this wine red even weave household linen (actually polyester). Try to be creative!