[cabinetman]

One way I've done them was to cut square wood lengths, approximately ¾"x¾", and use a ¼" round over along the two long edges. Round over only one long edge for where it ends. Then glue a few layers of felt or corduroy from the bottom edge on one side up and over and down on the other side. You could use a thin layer of ⅛" polyfoam rubber under one layer of material. This gives you two areas of flat to hold the material. The width of the lengths will separate how far the rows are apart, and the spacing between them will be how they are held once in place.

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