Paint the candle holders if desired, using light coats. Allow to dry in between coats (use a hair dryer to speed dry time). Use two or three coats depending on the look you want, sanding off some of the paint to allow the black to show through if desired.
Holding a couple of ribbons as one, tie a bow with long tails. Add other trims or ribbons through the knot in front of or behind the bow.
Place the candle holders with the square side up, one in front of the other. Open the first book to halfway through and place it down on the candle holders, creating an inverted V.
Continue to open up and stack books. Adjust as needed so the books are centered and the tree goes up straight.
Use glue dots to adhere the ribbon bow and any other embellishments, such as faux greenery.