Comics Compulsion. If not for the fact that they were at a sale price, I almost certainly wouldn't have bought them, because Battlefront's stuff is just getting more and more expensive.
There are a few different colour schemes possible for the A7V. It seems like each vehicle was painted quite idiosyncratically. The exact colours used are largely a matter of speculation, but there are enough surviving WW1 German artefacts painted in multi-colour disruptive schemes to be able to make some semi-educated guesses.
Fortunately, I'm not anal enough about it to be too traumatized if it turns out I'm horribly wrong.
I decided to paint them both in the same colours, but with different application methods. The first is painted with freehand airbrush, while the second is airbrushed using blu-tak masks for a harder-edged scheme — each block of colour will be further delineated with a black line around its periphery.
They'll both end up being substantially darkened by washes and weathering, which is really why I took some photos at this stage — so that I can have a before-and-after record.