Our customer said they wanted a minimalistic user interface, with a Windows 8 feel. However, I am a developer and do not have any experience with user interfaces. So, I went ahead and found the color codes Microsoft uses and now it looks like a unicorn puked into my program.
There are really good UIs out there, I just cannot figure out what the problem with mine is. I did a "dark theme" to figure out if it was about placements, but guess it is not.
What is the main weakness of my design or color selection?
Explanation about the UI:
The buttons on the left are for selecting forms. The rest of the screen changes according to the form selection. I am using winforms, if it matters.