I love the look of ebony weapons with the nightingale armor in Skyrim. Daedric armor and weapons don't seem special enough or I feel my character doesn't deserve it, so I rarely use it, but it can look good when paired with other armors, such as ebony.
Nightingale with ebony sword or blades sword, another combo i like is black vampire armor, nightingale gloves, morokei and vamp boots, looks awesome with the weapons i mentioned
All the Nordic weapons just look amazing, and the armor too. Silver swords are my favorite weapon for looks alone, although sadly also one of the weakest. The most badass armor combo I know is Zahkriisos, Skaal Coat and Carved Nordic gauntlets and boots.