Or maybe, so there is slightly less hatred for blind packs, for example series one could be clowns. There is one basic design with only slight variations, maybe 5 "Different" designs and have 1 "Super rare" design per series. The differences in the super rare figure could be that it's an evil clown, it's transparent, comes with a different accessory, whatever. Possibly do cases of 12 and there would be 2 of each one per case.....so the super rare really isn't that rare, it's just more different than the others. So if you wanted all the figures, just buy the case or if you just wanted a few for "army building" then just buy a few.
Blanks, my first series would be basic....6 different skin tones, Caucasian to African American and make the "Super Rare" one alien skin, reptile, zombie or robot or something.
Just some thoughts.