One of the best things about crochet is how many different textures you can create using simple stitches. In this one, the bulk of the crochet sweater is made from simple single crochet. However, you add strategically-placed bobbles at the sleeves and bottom to create highly textured trim. You don't have to change colors and still it packs a big design punch.
This one is sized age newborn to eight years. It's available for sale on Ravelry, and you can get a 10% discount by sending a Facebook message to the designer.