// colored concrete (from More Placeable Tiles) (3-bit img)
new ItemData("blue-refined-concrete", Color.FromRgb(0,0,255), ItemTypeEnum.Floor),
new ItemData("black-refined-concrete", Color.FromRgb(0,0,0), ItemTypeEnum.Floor),
new ItemData("cyan-refined-concrete", Color.FromRgb(0,255,255), ItemTypeEnum.Floor),
new ItemData("green-refined-concrete", Color.FromRgb(0,255,0), ItemTypeEnum.Floor),
new ItemData("purple-refined-concrete", Color.FromRgb(255,0,255), ItemTypeEnum.Floor),
new ItemData("red-refined-concrete", Color.FromRgb(255,0,0), ItemTypeEnum.Floor),
new ItemData("yellow-refined-concrete", Color.FromRgb(255,255,0), ItemTypeEnum.Floor),
// white default concrete
this add need in items = new ItemData[] and convert 3-bit image (8-color image)
А нахер я все на английском написал?