Tarp shelters are surprisingly simple to make, very sturdy and don't cost much. They are also very versatile with or without EZups.
After building the larger tarp shelter in my other post, I figured I'd share some info on how I created it, as well another version. Keep in mind, these examples can be used with any size of tarp and can be modified on the fly to fit within a specified area.
First thing, you should NOT be using the pre-made grommets on your tarp. They are essentially holes on the edge of your tarp, waiting to get ripped out by a strong gust of wind or someone tripping over a guy-line. Instead, create anchor-points on your tarp, which are much stronger!
ITEMS: Tarp - any size/type Poles - I suggest these bit.ly/MlNaqr Parricord - get the highly reflective kind Stakes - at least 10" Carabiners/Key Rings (optional) Small Achors (small rocks, foam sphere, corks)
Also, if you already have an EZup, you can most likely forego the tent poles (especially if securing the tarp to cars). Just make sure the tarp goes completely over the EZup and guy-lined down securely on the other side.
I suggest keep all of your knots tied and carabiners in after your first practice run, that way the next setup is as simple as tying a few cow hitches.