This worklows gives quick access to the colors defined in Apple's color lists ("clr"), see here.

Colors can be copied to clipboard in hexadecimal, integer (press [cmd]) and floating point format (press [alt]), respectively.

Objective C source code is included. Compile with clang main.m -fobjc-arc -fmodules -mmacosx-version-min=10.6 -o colorread.