The confusion in thsi thread is exactly why I don't use "canned" clip-art designs in any of my cues. Instead, I get my design ideas from lamps, or neckties, or ceramic vases, or interesting architecture, etc. So if someone ever wants to challenge n inlay design I do as a being a "copy" or a "knock-off" I can provide the original inspiration, but that never has been and never will be stock available designs that anyone could find in a Dover book or online clip-art.
I know of at least two cuemakers who have inexpensive software they use to "build" Celtic knot-work. While not exactly "cheating", it's not particularly creative either. Besides, I kind of like the challenge of conquering the geometry and math required to build knot-work from scratch. And, again, I never have to worry about being accused of using someone else's design.
TW