I am unsure if you will heed my humble opinion, great one, but here it is:
POSTERS I most definitely would pay for these, especially the Nova Refuge recruiting posters, though the Victory soldier could use a larger blade, in my opinion. I remember you had posted some SYBAA poster ideas some time ago, like the "I'm a better dark lord than you! I put my fortress INSIDE the volcano!" Those would sell quite well, too.
SHIRTS AND STUFF The shirts would be somewhat difficult, but with the popularity of your work I'm sure you could pull it off! (Ooo....awkward colloquialism.) Perhaps something like an image of a favorite Enomeg or other supersoldier on the front, that soldier's country emblem on the back, and a mini icon of their helmet on a sleeve?
COLLECTIBLE CARD GAME This sounds like fun, but I'm not much for card games. Still, I probably would buy a few just for the artwork....and bragging rights. I do like collecting cards.
LEGO ACCESSORIES Rather difficult to work, but I'm sure the head of Brickarms might be willing to tell you where he got his molds from. It'd be the best way to finally get plastic models of your enomeg helmets!
COMIC BOOKS YES, YES, YES!!! I'd love to see your comics in written form, so I can read them without having to plug in my laptop and look for a god wifi signal. If you were able to finally finish them, that is.
MORE DECALS Uhh.....can't think of anything here. Your decal collection is already awesome enough.
ANYTHING ELSE THAT MIGHT SELL Instructions for your Nova refuge creations! Or at least part lists. My eyes are tired from studying the pictures, and I'm not sure what I need to complete even a Hoplite Bike!
Oh! And here a link to a FREE website that sells custom t-shirts. http://www.spreadshi...ng-shirts-C3598
I'm not sure how it works, but they look professional enough to explain the process to prospective sellers.