If you want to push your backend and make it looks like awesomeness then I tell you how.
First step you gonna go to Backend --> Settings --> Customize Backend --> Styles
Then you can write own CSS code inside. Its quite easy and also works when OctoberCMS gets updated.
For example if you want a backend like mine copy this code insde the "style" form:
Change the color also in the backend tab like so:
After done that just save the form and you should see the result.
Write feedback via the comments and let my know what you think! Regards,