I put this up on the Karoove site but thought it would also be useful over here too. I have created a blending chart fro promarkers that is blank so you can print it off on the paper you normally use for your promarkers. Then you can colour in the pens you have. It then easily shows you what colours blend well together, according to Letreset. I basically went through Letreset site and wrote down the pens they sell in packs as blending packs as not everyone buys their pens in set packs. Its on a pdf and is free oh and it has some spare boxes so you can write down and keep a record of the colour combos you like to use for hair etc.
Here is the Promarkers Blending PDF for you to download.