well to change the colour you need microsoft office picture manager...
k well go here
program files>blockland>base>client>ui
then pick what you want to change the colour of double click it and picture manager will pop up right click the icon and click edit pictures then on the right side something should pop up click colour put amount: max and then under that change the colour when your happy with the colour go to save as and save in the ui folder.... if you already know how to do this dont make a bad comment