Our sumac this year has been gorgeous. The drupes are velvety red and can be cut and brought inside for beautiful arrangements. They look really pretty with that cedar.
Plus, they're not poisonous, so you don't have to worry if a berry drops into the soup.
They also look pretty with rosehips. Red, red, red.
I think the rosehips look pretty on their own, too.
Wear gloves if you go collecting rosehips. Lots of thorns. [It's worth the trouble though.]