One of the cool things about filet crochet is that besides filet charts, you can also use cross stitch charts - this opens up a lot of interesting designs. I've been working on Shiver Me Timbers off and on over the past year and finally finished it! The design is from a cross stitch chart on the Kincavel Krosses website.
For a border, I crocheted a solid row, did a row of mesh, and then added a final solid row, adding extra stitches on each corner every row to keep the piece laying flat.
I'm still working on the filet crochet tutorial but should have it up soon. Edit: It's up now here!
Happy Creating! Deborah