1/4" thick 3"x3" craft foam
1/16"x 16" dowel rods
Printed names of lashings
PVC "D" ring
Use string of different colors if you want. Cut the dowel to the desired length (1 to 2 inches works well). Tie the lashing using the links listed below as resources. You may want to put a drop of white glue on the knots to keep them from getting loose over time. Make all the lashings then hot glue them to the foam background and hot glue a PVC ring to the back.
If you want to add labels, print the names of the knots on paper using a computer - 10 point font is about right. Cut them out and use a little white glue to attach them to the foam.Resources: