I've never even seen the THX color scheme. You can always use the standard resistor color code for 0-9

Black = 0
Brown = 1
Red = 2
Orange = 3
Yellow = 4
Green = 5
Blue = 6
Violet = 7
Grey = 8
White = 9

And as a bonus, you'll be able to read the value of resistors - very useful skill in these days of chip components.