Claret and Blue - Who Do You Support?

As you know, I am now a supporter of Aston Villa of the EPL. What's the story behind the popularity of team colors "claret and blue"? There are 3 teams currently in the EPL that have home uniforms that are near identical. Confusing is an understatement. I am going to have to do a little digging to see if there some sort of story behind these colors.
West Ham United Aston Villa FC Burnley FC