I was thinking about making some Turkish henchmen in suits and fezes with mp40s, that's pretty 60s. :-)
Any other ideas on expansion?
I need look no further, and with envious eyes, at the various 25+mm ranges. In fairness, it's usually the character pieces I yearn for. You have shown how figures like your exobiologist can capture a well known character perfectly. So options and poses for various incarnations of spies from different organisations. In addition some more bodies, a large, steel toothed assassin, a figure with a robot/drill attachments too, hand. Ninjas with modern weapons. And various additional female characters, some armed and dangerous, some just alluring. Most of all, scuba divers (including female charachter scuba diver) with scooters, and maybe even mini subs. Armed Scuba figures on land. I'd also like jet skis too. I know that these may not be mainstream/viable, that of course has to be your decision, but I would love to see them nevertheless.
Seems like you are already going for some arctic figures, but spies in the snow and skiiers/skidoo a would be good. I would have put some of the snow stuff first but I have some for a 28mm game at Salute. Took a lot of conversion work too. I'd still like to see some alpine Arctic in 15mm though!