change colour from mailbox in Mac Mail

Question

Is it possible to change the color of the mailboxes in Mac Mail?

Here an example

Sometimes I manage to create Silver colored mailboxes by accident so I am wondering if it is possible to label them with other colors than silver and blue.

Answer 1

No. A silver coloured mailbox indicates that you deleted a subfolder within that mailbox. You need to remove the parent after removing all of the subfolders. Then the parent will disappear as expected.