Not long after I started to tweak my cross design, I realized that I could make it into a repeatable motif. With only a minor adjustment to the outer rings it fits nicely into a square mat:
(This pattern can now be found in my Etsy shop)
I had a new ball of DMC Cordonnet Special in size 80 just waiting to be made into something. I like the look of the smaller threads for large doilies or expandable pieces. If I have the patience, I will add more squares to this mat to see how it looks as it grows.
Here it is next to the finished cross design. The cross is tatted in Lizbeth size 20, color #623.
Here's the cross next to the drawing that it was based off of.
Works in Progress post, to see if I can get it posted to my Free Patterns section.