I think I would put the panel in the middle and piece the other pieces to both ends with a row of the same piecing on each side to either make a tabble runner that would go all the way to both ends and maybe over the end a little.
If there is enought the same as above with more pieced rows to add width all the way and make a throw for the end of the bed. I know there is a name for this but my brain is not working on names right now, I am dreaming.