I sometimes carried a (10'x10' waterproof nylon) tarp while backpacking. The tarp has little loops sewn at the corners, sides, and several points on the inside surface of the tarp.
Often, I just loosely staked down the corners, and maybe a couple of windward edges (if wind protection was important), then took my hiking stick (or a camera tripod, if I happened to bring one), padded the top of the stick with a t-shirt or whatever) and propped up the "interior" of my shelter.
You ended up with a floorless pyramid style shelter. You could vary how tightly you staked the edges down, to adjust ventilation.
No insect protection, of course..., but lightweight and versatile.
Though I never tried it, I don't think there's any reason you couldn't set up insect netting, inside the tarp pyramid, in much the same way... leaving a loose edge to crawl in under.