Brandseen is a great logo colouring game made by Kevin Xu (@imkevinxu), Cathy S Lee (@optimisticlee) and Ari Weinstein (@AriX) at Greylock Hackfest.
Use the colour swatch to estimate the nearest hue for 9 well-known brands and you are scored on accuracy.
A great test for any designer who wants to prove their worth (I managed a measly 75%).