Grab yourself a stack of basic clipboards from the likes of WH Smiths and decorate with pretty decorative paper, or even free wallpaper samples.
Start by making a template, trace the shape of the board onto a piece of thick card. Then brush some glue onto the clipboard making sure you have an even layer. Finish by affixing the paper and smoothing out any air bubbles.
Write guest names on pretty paper or fabric and clip to the board.