I see a lot of people using different colours in their texts lately, yet many aren't readable on certain forum layouts (f.e. navyblue on the black forum layout).
For that reason, I'll put every single standard colour down here. Try watching this topic with different forum layouts, and see what colours are readable on most of them 
The colours:
Black
Fire Brick
Red
Light Salmon
Lavender Blush
Maroon
Brown
Dark Orange
Orange
Antique White
Saddle Brown
Golden Rod
Gold
Yellow
Light Yellow
Dark Slate Gray
Dark Green
Green
Lime
Honeydew
Teal
Turquoise
Cyan
Pale Turquoise
Azure
Navy
Medium Blue
Blue
Light Blue
Alice Blue
Indigo
Purple
Violet
Plum
Lavender
Dark Grey
Gray
Dim Gray
Light Gray
White
