I got the chance to get the pattern for the Priscilla Cross and Square diagrammed over the weekend. You can access it through my Free Patterns page or go directly to it by Clicking Here.
Normally, I would test tat another version of the pattern after the diagram is completed, just to make sure everything is in its proper place. However, with this pattern taking so long to tat, I chose to proofread my diagrams instead of proofreading AND tatting. Let me know if you encounter any mistakes!
I also did not get the chance to put four squares together, though I'm fairly certain they can be used as a repeatable motif. I've made arrows on the diagram showing which picots to use to connect the squares together.
This pattern follows the same flow as the Priscilla Bookmark, which can also be found on my Free Patterns page. The only new stitch counts are in the central chains and floating rings.