theme

I'd like to create my own theme for Merlin, I can do so using a browser extension and editing the css, but that doesnt work too well for some things such as any images used as headers/seperators (i.e. in ROG theme). Is there some way to create our own and add them to Merlin itself so no browser...

Just picked up an Asus TUF-AX5400 router and although everything is fine, the web Gui is one of the most ugly ones i have ever seen. In fact it is so ugly that it is hard to use. I would much prefer the normal asus web Gui and if anyone knows how to get that installed i would be eternally...