I got the grey leather for usage with my iPhone 7 plus black and it looks great. I'll pass this to my fiancé once my jet-black arrives in about a weeks time and I've decided to go with the seablue leather.
can't wait to see some pics of the sea blue leather with the jet-black as well. delivery is on the 28th for mine.
if only apple had a matching apple watch strap.
They do have a Sea Blue leather band