Colors accessible from ZZT
ZZT-OOP has seven named colors: blue, green, cyan, red, purple, yellow and white. These correspond to the seven bright colors in the default 16-color CGA palette. With the exception of doors, named colors apply to an element's foreground color, and are paired with a black background. A handful of additional colors can be obtained through ZZT-OOP by using the change and put commands on built-in entities with hard-coded colors.
Below are examples of how to obtain gems of various colors using ZZT-OOP.
Dark colors on black
Dark brown on black
#put e torch
#change torch gem
Alternatively:
#put e bear
#change bear gem
Dark cyan on black
#put e ammo
#change ammo gem
Dark purple on black
#put e energizer
#change energizer gem
Gray on black
#put e shark
#change shark gem
Black on dark colors
Black on dark green
#put e forest
#change forest gem
Black on gray
#put e empty
#put e gem
White on dark colors
White on gray
#put e door
#change door gem
White on dark blue
#put e blue door
#change door gem
White on dark green
#put e green door
#change door gem
White on dark red
#put e red door
#change door gem
White on dark purple
#put e purple door
#change door gem
White on brown
#put e yellow door
#change door gem
Blinking white on black and dark colors
Blinking white on black
#put e forest
#change forest door
#change door gem
Blinking white on dark cyan
#put e ammo
#put e door
#put e gem
Note: The ammo won't automatically be overwritten by the newly-created door. You can delete it with #change ammo empty, or put the object next to an obstacle such that the ammo gets crushed when the door is created.
Blinking white on dark purple
#put e energizer
#put e door
#change door gem
Blinking white on brown
#put e torch
#put e door
#change door gem
Blinking white on gray
#put e shark
#put e door
#change door gem
References
Mystical Winds Encyclopedia v1.4: $MWENC_B.ZZT: 7. MW More In-Game Colors