This is interesting. The concept of using two shades of blue along with orange is intriguing. I've never been a fan of the odd shade of sky/royal? blue the broncos used to use for their helmets, so I would prefer a navy blue helmet, but other than that it is a great outside of the box concept.
Also so I just went back through the pages of this thread and looked at some of your concepts again and for the most part they are spot on, I like your style.