Admin Ads or other way for single site WP to be able to customize Dashboard

I had been checking out the Admin Ads plugin (and not reading everything about requirements) and discovered that it only works with the Multi-site setups.

Was hoping that there was a way to add custom logos and custom color schemes to the WP dashboards. I have several sites I work on and don’t host all of them. After working several hours everything looks the same and I ultimately added a couple of pages to the wrong site. Thanksfully it was 3am and I caught it and changed it before anyone saw my mistake. If I didn’t have to add photos as well I may have not even noticed my error.

Any and all help is appreciated.