If you're a regular you know the awesome work done at http://convoe.com
Also, check out the Lavender theme, which may or may not become the NodeBB default theme, replacing Cerulean. (What's the next Pokemon city that we take over?)
What are you looking for? Please submit your ideas. Do you like a theme from another forum software? Maybe we can port it. Or are you looking for something totally radically different from what we're used to? Submit your thoughts here
If you're interested in developing a theme I want to talk to you, let me help you get your feet off the ground. There is a theming guide but if you're still stuck I'm here to help!