Totally dig this...I'd do it in matte black or a deep purple!
BMW R-bike re-imagined
Harley Davidson Forty-Eight - Rough Crafts
Old-school machinery aesthetic applied to a bike. Modern proportions and design details (especially the tail and gas tank) suggest that it's not old (or is at least a recent hot-rodding involving substantial modification), but the aesthetic is classic and full of history.
Sportster Harley Bobber 883K Designed by Vida Loca Choppers in 2011