I have seen these on Fleabay a lot, and very cheap.

Colorful 100 LED 10M Fairy Light String for Holiday Christmas part | eBay
My wonder is, if it is possible to cut out the controller and run them off of a DMX signal with a little tech info? They arent outdoor lights, but a little sealing up of the bulbs should make them good enough for use on mini trees.

Call it a DIY RGB LED light strand.

Does anyone know of any lights like this with the little musical controllers that have been removed, or hacked as they say?