These are Scrapbook Paper Clips from a company called Scrap Paper Scissors. I picked these up on clearance at Micheal's craft store for $1.00 US. Regular price is $2.50.
Here is an example of each clip used on a Speed Rally record sheet. At first I thought the triangles would be the best, but it appears the circles and the square (diamond) work the best.
Of course these could work for other games, too.