By the time the G entered service they would have been using the 3 color camo. I'm not sure if any G's actually made it to the Eastern Front.
They certainly where there by the time the Russians had pushed them back into Germany.
They used the Ambush pattern as well as the 3 color scheme.
Some even had Zimmerite on them but they would have had to have been early G models. The ambush pattern was on the western front in Normandy and other places in France.
The early ones I have seen also used just 2 colors with white wash but these where still on the western front.
I'll try to dig a little further and see what pops up, but one suggestion is too look up the Grobst Duetchland Div. They had Panthers and tigers on the eastern front as well as the 1st, and 2nd SS Div. I'm not sure if the 3rd, Totenkomph Div. had them or not.