Just got back from the National Portrait Gallery, where Zilly Rosen (the woman who made the
cupcake mosaic of Obama) made a mosaic of Obama and Lincoln from 5,600 cupcakes! It her crew of about 7 right around 4 hours to assemble.
According to the pamphlet she was handing out about the installation, she wanted to make the Obama cupcakes out of chocolate but couldn't because they bake to a different size than the yellowcake she usually uses, so instead she iced Lincoln in vanilla and Obama in chocolate "as a tribute to their heritage," but the fondant used to depict their faces are the same four or five pigments, just in different ratios.
How cool!