Both my toddler and teenager love doing crafts...just usually not together. I loved the colortime "Groovy" backpack craft because it was an activity that both of my kids enjoyed doing together. The craft only came with 3 fabric markers (pink, blue, and yellow), but the colors blended well together to create new colors. The packaging doesn't tell you to mic the colors, but when you give a toddler a marker, there's no telling where the color will go. We totally found that our by accident!
I will recommend, however, to place a rag or other absorbent item in between the laters of the backpack. If not, you run the risk of having the colors bleed through to the other side.
Overall. the Colortime Groovy Backpack offered my children a couple of hours together doing something they love - crafting!