I came across the Birkbeck College project of Surface Architects.

It blew me away. These guys are actually building with color. Color is right there alongside brick, panels, glass, concrete and stone. Color is not a layer on top of the building, color IS the building.

Their architectural spaces are defined by physical material as well as by color. Putting the outlines of the physical shapes next to the outlines of the colors show that this is a tale of two stories. The one story is told by the physical dimensions. The other story is told by the colors. The two stories intersect, but are not quite the same. Together the two stories shape the space.

BTW: their website is most certainly worth a visit. It has a most remarkable use of color. It looks like they've extended their design principles to the website...