Finding a balance between not just "slapping a logo on a shirt" and maintaining some level of professionalism turned out to be trickier than first anticipated. Here is a concept I had in mind this evening:
Logo (larger): http://i45.tinypic.com/10zviug.jpg
or if you prefer landscape:
Logo (larger): http://i50.tinypic.com/i2q29t.jpg
The globe image was sourced from here
, and is allowed for any use with no conditions. I had to whip the pen tool out to draw the little guys around the globe (so no copyright issues there). The .psds are around 3000x1500px at 300 dpi with transparent backgrounds so the quality will be fine for print
(in the unlikely event you choose my design).
I thought about a back design, although couldn't come up with much more than just a bertie so didn't bother. To be honest I wasn't so sure about the design at first, although having sat and looked at it for some time you can just see a team member walking around some expo hall with it on, and not looking out of place.
Open to feedback.