For colouring your cement mix, what you need is " Boya za cement" ...it translates as paint for cement, but is also used for the powdered version.
As far as I recall, it comes in brown, green, yellow and red, but with a bit of mixing, you can get some interesting variations. It will dry a lot lighter than what you see when the mix is wet, so be mindful of that.
Hope that helps you.
:Chat
Pronounce the first word as two bits...'Boo Yah'.