I actually already do a few mood boards for my ranges but I have never thought of specifically just looking at the colour. So I decided to do them online like my others. I usually have them printed on thick double sided card at A5 size and file them away in a little folder. Then if I see other bits throughout the year I add them on with glue or deco tape.
So inspired by you I am going to work on a little colour board folder starting with two artists that I love!