I charted up a filet crochet pattern based on the Seal of Rassilon symbol.
Rassilon contributed a lot to Time Lord culture in Classic Who, so who's to say he didn't enjoy a bit of crafty-ness, too?
The Doily of Rassilon:
I made two different versions.
This one was done in gold metallic crochet cotton.
Size is around 15 inches (38 cm) in diameter.
These were done in a variety of crochet cotton colors (silver metallic in the middle).
Size is around 10 inches (25 cm) in diameter.
The pattern chart is
here (opens in a new window).
Since the pattern is just a 40 square x 40 square chart, it can easily be used for knitting or cross stitch, not just filet crochet.
Enjoy!