Coloration of pronotum in this species is typically uniformly green or brownish. Green phase individuals may have violet/reddish-brown shading along dorsal median of pronotum and costal ridge of forewings. Pigmentation may change somewhat in between nymphal molts but remains constant as an adult, i.e. they have no ability to alter their color once they are adults aside from signs of normal aging and UV saturation. Brick walls and the like are artificial substrates that mantises may be found upon through the course of their movement to find food/select mates. These are transient resting locations/obstacles and are not natural biological niches. As such, mantises do not adapt their behavior or color to match said obstacles, as they do not remain at such locations for very long-- for, if they did, they would likely starve to death and/or lead out a lonely existence apart from a conspecific mate. Thus, the body pigmentation matching the bricks is merely coincidence and nothing more.

Moved from Tenodera.

This is an adult male Tenoderan. Whether it is T.sinensis or T. angustipennis I couldn't tell you. Both species are present in your area.