Paint the wood trees with several coats of white craft paint on all sides. Let dry.
Tear out two book pages and place them on a paint proof work surface (like wax paper).
Place a small blob of your first paint color on wax paper or in a palette. Add some water to thin the paint down to a wash. Paint the two pages with the first color and let dry.
Repeat this process with the remaining paint colors, I painted two pages each of four colors, for a total of eight pages. Let dry completely.
When the pages are dry, tear them into pieces. Tear off the non-painted edges first, then begin tearing the pages into pieces. Sort them into piles.
Starting at the bottom of one tree, place some Mod Podge down with your brush, then place some of the dark green book page pieces down. Mod Podge over the top and smooth. Continue adding the first color until you've covered the bottom quarter of the tree.
Repeat the process with the next color, overlapping the pieces as you go.
Cover the entire tree with the remaining colors. Let dry. Repeat adding book page pieces to all trees.
Add a second coat of Mod Podge over all the trees, making sure to get the edges. Let dry.
Once dry, turn the trees over on a craft mat and trim with a craft knife. Repeat with all trees.
Add a coat of Sparkle Mod Podge to the top of each tree, if desired. Let dry before displaying.