We are very happy with the way Skylines editor looks and is developing, but there is no reason why you can not do a mock up ui in photoshop. Remember that certain layout features are a restriction on the QT system and clean functionality is required. We also do have planned some cool visual aids once the feature set is fully usable and stable.
I know as a developer you guys were more concerned on the functions rather than the style so I want to lend a hand in that as well.
LOL I have been a commissioned artist for a lot of visual work over the decades, and solar portal has had work in exhibitions. We are artists but currently time has to be divided between functionality and artistic flare
Skylines core approach was from the art side and what we as artists want out of an engine.
What we do need is a complete set of icons for Skyline!
edit: we dont like the silver look as this is very old school lol