I am a big office supply junkie so I find lots of quilt related uses for things like binder clips, file folders and organizers. I have sets of binder clips that I have numbered 1-40. I can attach a numbered clip to the design wall with a map tack or pin through the handle part of the clip. Then I can use the same clip when removing blocks from the wall and keep the blocks in order. I also use different colored markers so can add an extra level of sorting if I need more than 40 for one project.