100 DIY Upgrades for Under $100
Create Cubbies in a Bookcase
How to do it: Cut vertical dividers to the depth of the unit minus ¾ inch, and secure them in place with glue and finish nails. Face dividers with 1x1 trim flush with the shelf fronts.
Estimated cost: One sheet of ¾-inch plywood and three 1x1 strips,$26; Home Depot