Thanks for the variety of submissions, treatments and testing some new colors, etc. I like the 'globe' icon treatment as an element. I keep looking at the green because it pulls you in, but can't decide yet. I think
#56 is the best combination an some variations of that with colors, tweaks may be the best approach.
#51 and
#52 are a little too much like a space ship. Also, the 'compass arrow' in the globe is actually indicating south rather than north.