I just finished this cat-cut hex tarp per the guide over at diygearsupply.com from some grey silnylon 2nds. It's got a got a grosgrain ridgeline. I'll be making some Grizz-Beaks to go with it soon. I added a couple of DAC Featherlite poles in an X-pattern that fit into pole pockets in each corner. This really opens up the tarp, keeps it taught, and gives it some structural support. Anywho, here's a few pictures: