The CGA colour palette was horrid on RGB monitors but on Composite it could look quite good for its time. Not Amiga-level good but good enough. Of course composite monitors were not really a thing in the IBM PC world so it was to little avail. Here's an example of a screen in the mentioned horrible hot-pink palette:

https://www.pixsoriginadventures.co.uk/wp-content/uploads/20...

...and here's the same screen viewed on a composite monitor:

https://www.pixsoriginadventures.co.uk/wp-content/uploads/20...

These images come from this page:

https://www.pixsoriginadventures.co.uk/cga-composite-graphic...

If this isn't enough it seems to be possible to coax ~1000 colours out of these cards as well:

https://int10h.org/blog/2015/04/cga-in-1024-colors-new-mode-...