Thanks for all the advice. To be honest I had never even thought about using this as a watermark but now that makes sense. The original design was just for the website but I can see the value in a coherent "scheme". After some thought I simplified it a bit by removing the compass. Here is the new version. It's still fairly small but I think I like this design better. I'll probably tweak the size a little but I can see me using just the "JT" part for marking my maps.
Click image for larger version. 

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