a few ideas are, if you want or have the time. bird cages, boxes, a spine for a kite. for some of the larger ones, around 2or3inch thick, table legs, and or tables, hutch, cabinets, plant stands and such. as for mulch, it would make ok mulch but you would have to run it through a wood shreader or mulcher, the machine that people use to grind wood limbs..

No. Build your trellis. They will not root that way.

I don't know of any that stay green. All the ones I've seen in stores that were green appeared to be dyed.

I bought a 4'x8' trellis at Oceanic arts made of 3/4" dia poles spaced 4 inches apart that I really like. They also have rolled pole fences that look good wrapped around 4x4 posts.They have other styles to choose from that are roughly the same price or cheaper than bamboo poles, but not as large (or impressive) as 1-1/2" or 2" diameter would be.They also have some inexpensive woven mat materials and other trim like items you might be interested in. Also, there is a place near the port of Long Beach called Iron Man (Iron man has some cool insanely cheap rustic wrought iron furniture, trellis, plant stands, etc). There was a company sharing Iron man's warehouse that sold rattan furniture. I bought some cool bent bamboo trellis there a couple of years ago. I am not sure if they are still around but those were a bargain compared to the cost of bamboo poles. I bought a book called Building Bamboo Fences by Isao Yoshikawa that has some great inspiration photos and knot tying instructions. You might find something like it at the library. I have promised to make a pair of bamboo gates for my backyard and am only waiting for some momentum. Lastly, you are welcome to email me if you want some photos of any of the things I have described.