here.) And here's a video of someone using the stamps.
The stamps are carved from calabash gourds & you can see on the 2nd example that they are curved. You'll notice in the video that the printers have to "rock" the stamps a bit to get the complete design to stamp.
A piece of fabric uses many different stamps, broken up by the colorful embroidery used to stitch 2 strips of fabric together (again, strip woven fabric used as part of the overall design), then they use a piece of wood that looks like a hair pick to make the parallel lines that also make the outline of the checkerboard.
The stamps represent ideas and proverbs. Head on over to adinkra.org to see an explanation of what the different symbols mean. (Click on the symbols at the top of that page.) Photos of a stamp carver hard at work are here.
We bought our stamps at a tourist shop in Tamale and they haven't been used.