I have several pairs of black boots, I love them all, but after I've worn them a few times, they end up with white scuffs and scratches on them. I've found if your boots are still in good shape, just scuffed, you can use a permanent black sharpie marker and cover the marks!
another great use for a sharpie....when i buy a sweater/shirt/jacket with plain buttons, i use a sharpie to draw designs on them. really jazzes it up. best on a solid top with plastic buttons.