I'm exploring ways to change the color myself, since buying a new set would run me around $50 for the whole tree. Today I tried tinted silicone:
Here's what you'll need:
DO protect your skin with rubber globes
DO this project in an extremely well ventilated area
DO practice a lot before the real deal
DO NOT get the silicone or mineral spirits on your hands, it can burn
DO NOT make too much at once; it'll cure before you can use it
Mix a batch of the paints you chose to use. If you plan to use the color paint straight from the jar, skip this step.
Dip your bulbs in the silicone until it touches the plastic at the top. If you don't dip it in all the way it'll have a hard time adhering to the bulb and you'll find a lot of it just slips right off. After the bulb is covered, slowly pull it out to create the nice little tail. If you've thinned it out, you should have something like above. It's covered in a very thin layer with a short tail. If you want a thicker layer with a longer tail, leave the silicone full thickness and pull the bulb out VERY slowly.
Take your time with this. It's not hard to do, but it takes time to learn the best technique to achieve the look you desire. If you don't like the way it's looking, wipe it off with a rag soaked in mineral spirits before it cures and you can try again, no harm done.
This is so much fun, and I can see the applications year round! Can you just imagine the Halloween lights?! Oh, I'm daydreaming again.