FCEUltra (NES emulator) is next in line for the UI update that was a part of PCSXBox v4. I need a default skin for it before I can release it, so if someone is interested in doing so, let me know. Skins made with PCSXBox v4 will be completely compatible with new upcoming, FCEUltra.
Additionally, since I'm updating it, if there are any new features you'd like to see in it, now's the time to ask.
Please read over the current feature list of PCSXBox v4 before making your request. Everything that is a part of PCSXBox will be a part of the upcoming FCEUltra (save states, screenshots, graphics filters, autofire, etc, etc, etc)