There are several websites that distribute free printable Skylanders coloring sheets. You can also find Skylanders coloring books at many of the big box department stores, which usually contain additional activities and stickers.
Skylanders coloring pages often include pictures of Skylanders Giants, Skylanders Trap Team, Skylanders Swap Force, as well as pictures of the original Skylanders characters.
Many large department stores, such as Wal-Mart, Target, and Toys 'R Us, sell Skylanders coloring books as well. These books vary in price, but most contain additional activities such as mazes, fill-in-the-blank, connect the dots, and tracing. There are also Skylanders coloring books that, when used with special crayons provided and a special viewing sheet, turn into a 4-D experience for the artist.