Is it really not possible to add new colors to the list cover?

[debbie bone]

I want to add brighter covers to my lists, then I want to organize by color..... is this just not possible?? Lables are just not going to work for me  thanks

[Rasmus Wulff Jensen]

Hav you tried full color covers? Thing that is lights up the most

Also if on a paid plan you can color lists like I'v done on the 3rd list in the screenshot