I learned during a visit to a Hong Kong McCafe that they create such designs the same way people paint the street number on the curb: with a stencil guide. The powder is just cocoa.
A small cup will run you $23 HK (~$2.97 US) which is fairly comparable to prices here. While the design seems unlikely, the flavor seems ripe to come here to the States someday as McDonald's vies with Starbucks for your coffee dollar.






