There are the high tech family music accoutrements (iPhone apps, videos) and then there are the low tech ones. Coloring books -- clearly the latter. Justin Roberts isn't the first to put together a coloring book -- I'm partial to John Upchurch and Mark Greenberg's coloring pages -- but he's released some fun pages.
My tendency would be to ask a child to use yellow for the Yellow Bus, but I know that's not right. Download the coloring book here.