I started with a large LED strip, custom cut it to the size, ran the power, installed a switch, and neatly hid wires. This project can easily be adapter to anywhere you need some lighting under something. (eg. kitchen cabinets, work spaces, shelving, display cases, etc.) It is also a good guide on how to install lighting strips in general and can be used as a base for other low voltage lighting projects.
Step 1: Materials
Here is everything I used to complete this project:
The total cost was around $40.