This is an image I have created to load into our desk and which I use virtually exclusively for selecting colours for fittings.
The first row is a basic selection of bright colours; row 2 has a mix of colours (great for creating "random" colours); row 3 has pastels; row 4 is a fade from dark blue to white; row 5 is a traditional rainbow; row 6 is a rainbow of secondary colours; the last row is a variation of colour temperatures (great for blending with other light fittings).
I created