Oh, Paula...I wish I could take you on a Picking trip!!!
Any branch material is fair game. Your landscape is a bit different than ours, but still, just find your self a country road, and look at some of the beautiful branches Nature gives us.
We also love Manzanita, but it is really expensive, so I like to sub with hawthorne..really strong, and virtually a weed tree here. Just be sure to snip off the needle- like thorns so you don't poke out anyones eyes. Birch is a natural, and you can prune a birtch tree by up to one third, and it will grow back fine next year. Grape vine is rampant here, so we can rip it off fences, and farmers are actually greatful. The list is too long to continue...just get out there and give it a go.
Every area has it's own gifts...I have been trying to import Southern Smilax for years, it is a total weed in the American South, but doesn't grow here...it's a perfect vine for trellis covering, and yet, the one time I found someone willing to send it to me the cost was crazy high....400$ for a case not much bigger than a box of salal. I'm sure all of the cost was shipping, because I have seen it growing in the US South...it's a weed!
The trick is to find an area where you can pick without prosicution, and check for bugs, and then just go for it.
For really large peices, we often set our branches into a base of plaster of paris, then top the container with oasis to hold the fresh cut materials, but if it is for everyday work, then straight into oasis, or even just into water will work fine.
For one event, we created a tunnel of branch material that was 12 feet long, 8 feet wide and 10 feet high. We built the basic structure out of aspen trees ( a weed tree here) that we tied off to pole and drape piping that we rented from a local rental company for less than 100$.
One of the most entertaining questions we answer at work is from customers who look at the branch materialwe use in our arrangements, and ask..."But where do you buy all these branches?" and of course we tell them that we sell them right here. What we don't tell them is that we pick them from our back yard, or from the ditches along the highway.
We have picked masses of branches and painted them with white latex paint using an air gun...looked really great, but for a true winter wonderland effect, you would want to top the white paint with flocking...that requires a special machine we do not own, and should really be done in a paint booth, which we also do not own, but you could check with a car dealership. They are set up for that sort of thing, and would be happy to paint and flock for you.
Happy picking!!!
JP