The way WW2 German tank camo worked is this: From 1939 to 1942 the factory base colour was dark grey, apart from some two-tone brown ones for the Afrika Korps. There were instances of crews applying extra camo in the field, particularly in the desert before the factory brown tanks began appearing there and in Russia where mud was often used.
In 1943 the factory base colour for non-Africa-bound German vehicles changed to dark yellow, actually a very light brown. The reason for this was complaints from Eastern front units that the dark grey colour was useless as camo against the brown Russian steppe terrain. Tank units were also given supplies of olive green and red brown paint that could be applied over the light brown as needed. In 1944 the policy changed to factories applying the red brown and green paint themselves, to help camouflage the tanks from Allied aircraft while on the way to the front.
In 1945 the official base colour was changed to the olive green, with the dark yellow and red brown applied over that. However by this time factories were just using whatever paint they could get hold of so not all of them had complied with this by the time they were overrun.
Photos of tanks painted in the 1945 dark green base colour are not that common and I have skinned any suitable ones I or Lyric1 have found. In general you should be looking at the wheels as they were usually left base colour. Some Tiger IIs, Panthers, Jagdpanthers, Jagdpanzer IV L70s, and Panzer IV Js (OK on the H shape) were painted this way, but usually with the other two colours applied over the top as well. For the dark grey scheme only the 251, Panzer IV F and a few early Tiger Is are applicable.
