The window trim as well as the built-in hutch in our dining room are dark stained wood. So I chose a matching finish for the shelf (same as the one on Pinterest, purchased at Target). I found the exact same brackets for the wine glass rack too (on Amazon.com).
I tossed a canvas print on top for now. Haven't decided yet what I want up there. It's rather high up so kids can't reach & adults don't graze it while walking past.
Did you notice there are only 3 wine glasses? Wouldn't you know it, the day after the brackets arrived in the mail I dropped (and shattered) one of the wine glasses!