First revealed in January at CES, Griffin and Crayola are now shipping their volume-limiting, kid-friendly MyPhones ($25) and MyPhones Earbuds ($15). The larger of the two is MyPhones, on-the-ear style plastic headphones available in either pink/purple or blue/green. Included in the package are a number of colorful stickers, as well as several blank ones and three markers to color them in, allowing for kids' customization. MyPhones Earbuds…