Skyrim DawnGuard- What helmet matches with the Ancient Falmer set?

There aren't many helmets that match that unique armor. You should try Ebony, silver colorish helmets (Imperial, Steel), or the Helm of Yngol. The Helm of Yngol would be the good in my opinion and also has a frost resistant enchantment. It can be found in the throne room of Yngol's Barrow on a skeleton who is Yngol the son of Ysgramor. It looks kinda cool and could go with the armor. It is near Windhelm and will need the coral dragon claw which can be found in side the dungeon itself. Careful since there will be a boss at the end near the Helm so prepare for a fight. If you don't feel like doing that then the Ebony Helmet which has black and white colors is also a great choice. If you want to match then get Ebony, but the Helm of Yngol just looks cool in my opinion. Look at the links and choose your pick.