Ya, I typically prefer darker sport coats too. The one I posted is fairly dark. Plus, I pretty much never wear pants as dark as in that northern lights challenge. It goes very well w/ med. gray, light gray, and cream, or blue jeans.
Here's a very blurry pic of it w/ a pair of stone pants. Not a great pic, but it shows the contrast pretty well:
Not my classroom, btw. I was just a guest.