Nothing special but an interesting thing to try. I tend to find that you have to adapt to whatever material is available locally. Many of the places I go there is plenty of coppiced hazel and willow and lots of bracken so thats what I use. Its also never a problem cutting bracken - it grows quick and farmers are glad to see the back of it. a few poles from a stool of coppice is not doing any harm either.
I find the bed surprisingly comfy - a good thick layer of spring branches and a massive amount of browse (18" or so of leaves - it soon packs down) and you have a bed far warmer and more comfortable than any air bed. I've found a good small fire with a reflector means, in the UK at least, that you are very cosy indeed
Red