Calvary Baptist in Conroe. The Helmets color either red or black, but if we have to white.
Color's easy ... any of the helmet folks can make them any color you want. Of course, for you, red or black is fine (I'd stay away from white). If you want "midnight rain chartruse," well, that might cost a buck for two more. Unless you got some lady who is an interior designer picking your school colors, the standard colors work well.
A few years back, I was invited to tour the Riddell All America helmet refurbishing plant in San Antonio. They were in the process of painting the Dallas Cowboy helmets that day ... it wasn't an order for "blue," but extremely specific hues...
One thing I learned that day is that most professional football players have a helmet that they prefer. If they move from team to team, the helmet is sent to the refurbisher and repainted with the new team colors.
By the way, if a refurbisher (and I forget the nomeclature of the group that accredits refurbishers; but I can tell you that Riddell All American in San Antonio is probably among the biggest) finds that a helmet does not meet specifications, they will saw it in half and trash the two halves separately. Somewhere, I've got an article from several years ago, where they found that less reputable folks would rifle through their trash and resell the defective helmets.
Send me a PM or email and I'll send you the PDF of the presentation I made to the coaches clinic a couple years ago.