This class originated as a Celtic Pendant, but has been broadened to be ornate pendants.
Read about Celtic knots on Wikipedia or in any of these great books at the Chicago Public Library.
Design Specifications
A pendant less than or equal to 2" by 2"
Learning Outcomes
Downloading and modifying a design to specifications
Preparing files for a laser cutter
For an ornate design, look through these Craftsmanspace free patterns.
For a Celtic design, there are some great samples at Aon Celtic Art, or through a Google Image Search.