All the craft stores have good fiber reactive dyes available, even Walmart. For great directions for dyeing results go to Dharma Trading Co. and check the lessons on their site. Walmart also has a good tye dye trick. They sell stripes of concentrated dye fabrics that you tie around your project. When you place them in water, the dye transfers to your (pillowcase) and you get dyed designs. This might be a better idea for kids.