This article is from the ZTerm FAQ, by Les Jones firstname.lastname@example.org with numerous contributions by others.
The ANSI colors in ZTerm 1.0 are editable. Choose Color Preferences
from the Settings menu and doubleclick any color to change it.
Ordinarily you can't edit the colors in ZTerm 0.9, but you can if
you use Jon Snell's ZTerm Speed Patch. Once you install the patch,
open a copy of ZTerm with ResEdit, doubleclick the pltt resource,
doubleclick the ID 128 resource, and edit the colors by