For starters, take the Billy bookcase from IKEA.
He's a great basic but a little plain Jane if you ask me. To dress him up, find a fabric you love—I used this modern geometric from Calico Corners—and adhere it to foam-core cut to fit the inside backs of the bookcase.
Use foam tape on the backs of the boards to adhere them, and you're set!
That's a good boy Billy.
And when you're bored, simply swap out the fabric for a new one, and Billy gets a whole, new look. For detailed directions, pick up the Easy Decorating issue of Woman's Day on newsstands now!