I've developed a bit of a thing for navy suede. Not sure what it is. It has an awkward in between-ness about it. I think of navy as quite a refined, slick colour. It's a colour commonly found in things like suits and cars. Suede on the other hand is rough, usually in earthy tones and used on workwear. It's used well in these examples combined with brown and used for boots.
top to bottom:
Church's f/w 09 via selectism
B Store 'Herbie' boot via selectism
Supra Dixon via flatspot
Vintage 80's Womens Boots via etsy