There are at least 20 Gordon tartans, as well as variants like the "weathered" which is a favourite of mine.
I also found the purple/indigo colour attractive, so when I received a woven sample of my own tartan (also strongly influenced by the Gordon tartans) with the indigo colour, I knew I had exactly what I wanted. My avatar is close to what you will find under entry #10108 on the Scottish Register of Tartans, but by comparison to the actual material, it's more of an "ancient" version. The actual material has a rich leaf green with indigo blue, much like the colours in your first example (except with a purple stripe instead of the yellow).
If you are ordering a kilt, I'd suggest getting a swatch first to be sure you get the one you like.