It's a bit different than the old version in that now the bed HAS to have legs. But other than that you're still free to texture it however you want.
I suggest going in the game, looking at the bed, and then opening the texture pack and rearranging your "old" bed texture on top of the new one. It may take a little bit of rearranging but with some testing and tweaks I'm sure you can figure it out. =) Here's an example with a texture I just updated for my own pack: