Ever since coming back to Garry's Mod, I've felt the lack of something important while playing. I figured it out a few days ago and have gotten the permission from the creator of the mod to share it amongst everyone here.
Do you feel like Gmod looks ass? All the text, all the colours, just too small/large or just dull, lacking that modern touch. Back at Serious Gmod, Yatty had created a simple fix for this issue in the form of his Black and Blue Gmod skin. It makes your gmod look good. For example:

An epic looking bar.
Or:

An updated larger, more transparent and yet better looking chatbox.
Or a console that doesn't look ass.
The settings menu has also been changed to adopt this styling.
You can thank Yatty for creating this mod way back in 2016/17. I have attached the zip folder with the files and instructions on how to install it; unchanged whatsoever from the original files that Yatty created.
Do you feel like Gmod looks ass? All the text, all the colours, just too small/large or just dull, lacking that modern touch. Back at Serious Gmod, Yatty had created a simple fix for this issue in the form of his Black and Blue Gmod skin. It makes your gmod look good. For example:

An epic looking bar.
Or:

An updated larger, more transparent and yet better looking chatbox.

Or a console that doesn't look ass.
The settings menu has also been changed to adopt this styling.
You can thank Yatty for creating this mod way back in 2016/17. I have attached the zip folder with the files and instructions on how to install it; unchanged whatsoever from the original files that Yatty created.