You can buy these lights by the foot, I waterproof them myself with this hose and silicone...

They light up any color using a remote control. You can cut it to any length.

You also need to hook up some switches. the lights can be controlled by remote but the control module stays on draining a little. Also if you want to have brighter lights you can hook up switched zones so you can have inside and outside lights instead of having them all on at the same time.