If you're thinking about making a DIY tarp, the King Crimson is a fine example. A bold, catenary-cut hex tarp designed for use in hammock camping. Tarp features both cat-cut edges and ridgeline as well as grosgrain reinforced corners for strength.
Project: King Crimson
1.1 oz Silnylon - Crimson - 8 yds
5/8" grosgrain webbing (tie-out tabs)
7/8" grosgrain webbing (corner reinforcement)
Seam sealant - e.g. Silnet