I just bought Baby Bel her first coloring book today. She since loves Elmo, I was lucky to find a Sesame Street coloring book with Elmo on the front :-). She had been coloring at restaurants, those that provide crayons and a placemat or booklet to color on. She's pretty good at targeting specific objects in the coloring book, like coloring Elmo.
A couple of months ago, I had bought some crayons and poster board for her to scribble on. But she couldn't really do much then. Little by little she's tried out our pens and pencils. Finally now, she's got the dexterity to actually enjoy coloring. She sat coloring her new book this morning for about 10 or 15 minutes by herself! Of course, I played some Sesame Street music for her while she colored.