A few weeks ago I started a new little herb patch in a little corner of my garden. I needed some fencing to keep critters out, the two, four and three-legged ones :).
My neighbors accross the street had several trees they were trimming, so I took the branches. It's not the greatest or prettiest of wattle fences, but it was free and it's functional. Doesn't get much better than that for me. The seeds and starts I planted a few weeks ago have nearly doubled in size, so the fence is obviously working.
There are several pictures and tutorials online, just do a google search for "woven" or "wattle" fence. I didn't follow any instructions, I didn't measure anything, I just started digging holes, cutting branches and weaving everything together. It sort of took on an organic shape of it's own, and I'm happy with that.