I Suck at WPF

Creating decent WPF applications is definitely hard for someone design-challenged as me. I've been trying to polish a small sample WPF client for a WCF service sample I've been playing with, and this is the best I've managed to come up with:

Ugly, isn't it?

Doesn't quite help the fact that, for some reason, the damn application just stopped using Visual Styles all of a suddent (don't know what's going on yet, but the controls are just not using the visual style anymore). Ohh well.