The Cool Blue is the name of the mission where Hans travels to Gola Highlands, in search of a new colour. He asks you to find a Lapis Lazuli for him, which luckily is in Gola Highlands too, so he can make some blue paint, hence the name. The Lapiz Lazuli is found in an low area at the very top. You need to drop down onto it, dig it up, then get the Giraffe to lift you back up and take it back to Hans. He will give you 2 woofs in return.