I maintain many websites across platforms such as WordPress, Umbraco, Kentico and Tangora. While not the competence that I advertise first, I do occasionally design and build WordPress-based websites.
Here is a list of examples, but please do note that while I created these websites, I am not maintaining all of them and some look quite different from when they were originally delivered.
Lunastone Pedals
Digital Audio Support
Digital Audio Denmark (design only)
NTP Technology (design only)
Morley Products
Karens Årstider
Rasmus Birk