Here are some of my concepts. I've gone for something that's fairly clean and simple, yet striking. Creating an icon that works well within the logo or as a stand alone element, one that can be used for things like favicons or watermarks.
The logos are 100% vector so will scale well to any size, and works well in full colour and B&W.
If you'd like to see any variations then please do say.
Thanks for the additional feedback and comments, always appreciated. Of course would be a pleasure to work up some iterations ... and here they are.
I've lightened up the icon, repositioned it, resized and experimented with colours. If there is a specific combination you'd like to see, then please do say and I'll work it up.