To make your own clipboard, you will need to find a thin scrap board. If it isn’t the right size, you will have to cut it to fit standard office paper. If you don’t want to bother cutting your board, ask around until you find something approximately the right size. Paint it with spare paint from your shed or leave it natural. When it dries completely, attach a clip like the one in the photo. The clips can be found at office supply stores.
These clipboards make excellent frames for displaying artwork. The clips already have a hook which makes hanging up easy.