Improvements on design

Well, to be fair, I'm a little bad at design.

Things that I think that can be better

1. Color palette: a predefined color palette should help to avoid some inconsistencies at time of adding new functionalities.
2. Distribution of elements across the WebUI: simpler things are better than complex ones. The more "self-explanatory" the UI is, the better.
3. A bored, sad, lonely, dark theme: the constant usage of a dark UI is a bit depressive sometimes, and useful in others (like in the night). Letting the user choose which theme is better for him should solve the depressive part.

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Don't know too much about design like me? No problem! Ideas are welcome too!