I'm new to paper play and had never heard of Core'dinations. Therefore, recently I was pulling my hair out opening 3 windows at a time comparing colors from 2 makers to the 4 sets of G45 that I'm working with TRYING to coordinate colors - even using the Bazzill color finder and Matchmaker it was FRUSTRATING and still you really don't know til you get them if you succeeded. I can tell by looking at the colors there WILL BE gaps that I need to fill in color wise (I am ADDICTED to color) BUT WHAT A BRILLIANT IDEA to provide THE BASE COLORS FOR US!!! and using them we will know whether to go lighter, darker, brighter, more muted to fill in those gaps - PLUS color cores are just SO MUCH FUN - I'm going to try them on my tombstone rubbings too JUST TO SEE what happens - I can hardly wait to emboss, rub, ink and sparkle these up!!!