When I was buying the material for my bargello, my tutor said to buy two light coloured ones and two dark coloured ones then the others came inbetween... I bought 12 in total... greens, apricot, pinks (would you believe) everything matched up well... dark green, apricot and dusky pink... light green, apricot and dusky pink... also when placing them together, check through your camera to see if they come together well...