Are you looking for the three color ambush scheme? If so, then here are the colors:
71025 Tank Yellow (Dunkelgelb)
71041 Tank Brown
71096 Panzer Olive Green 1943
At least those are the three colors I use and they look pretty good. If you're looking for just the standard dark yellow, then 71025. The two tone green and yellow? 71025 and 71096.
Here's a 1/48 Tiger I with the two tone: