If those of you who do the banners ever run out of ideas, don't forget this one; though I'm sure it has been used before:
I just read a good biography (by William McFeely) of Thomas Eakins, who painted this. Some of the happiest days of his life were during a summer trip he took to the Dakotas, where he could ride all day and forget the sting of his dismissal from the Philadelphia Academy for his Whitman-like free mindedness and unconventionality.