I could see us being the source of much ridicule if we wore that purple and gold helmet (the braid...). Oddly, I don't mind the white/ purple, but I'm a fan of negative space, so it certainly caught my eye.
Some of these are creative. I agree with Clanzomaelan on the white/purple Vikings helmet. I'm not sure why, but it catches my eye and the more I look at it, the more I like it. It's not perfect, but it's pretty neat.
Browns - at least there is something on the helmet
Note: The first Raiders helmet is a mess, the emblem on it doesnt even line up with where the helmet ends.
Having said these are the ones I'd think were ok to use, I'm a traditionalist, so I really just want every team to go back to the design they had in the late 60s / early 70s. Those who came after should have a design that would fit in with that era.