I thought I'd pull up my Filet Crochet program again and fiddled around with this mat today.  I haven't done filet in a long time, either crocheting it or fiddling with the program.  *How this will turn out in real life is anyone's guess, but I'm going to start working on it any minute now.  If you work it up, let me know and send me a pic of your finished creation!

(Click on the picture for a printer friendly page.)