Hi everyone,
I'm the developer of the game Planet Centauri, and after many attempts for upgrade of our game gui, I request some tips because I'm totally blocked.
My first try is the skin we actually use, it's simple and sober, but not very nice...

Our second attempts have some interesting issues, but there are also some problems.

Also there are two big contraints:
-the slots for items should be light colored
-the global colors cannot be too light or too dark, because the background may vary
So if you have some advices, corrections, tips, or ideas, you will be a great help to us.
Thank you for reading.