A few years ago at a craft fair I saw the most amazing thing.
So I bought it. It was so shiny and beautiful!!!
And now I have attempted to make my own.
They aren't as perfect as the one I bought, but I did my best.
I bought the 12 pack of glass bulbs at the dollar store, for (surprise!) a buck. The paint and other materials I already had on hand. I just used regular white craft paint, which was fine even for the silver ball. You could use whatever color you want (but I like white, be a sheep - use white). I only took off the lid and used the paint that was on the inside of the lid. Very little paint required. And no messy cleanup if you follow my example.
Here's the trick:
No paintbrushes needed. Just a pencil eraser with a straight pin stuck in. If you can't manage to stick the pin in the eraser without drawing blood, walk away now. I'll make one for you and you can pick it up at my house. The green ball was my practice ball, it took a bit of time to perfect the technique. If you make a mistake, just wipe it off quickly with a wet paper towel.
Remove the hanger from the bulb, and slip it over a pencil. Wipe it down with a clean cloth to remove your grubby fingerprints. Then do yer painting, and put the pencil into a cup to dry. Easy as pie.
See? Any idiot can do this. I did.
The real skill is in not getting paint on your clothes because you're a klutz (me) and trying to come up with a suitable design that doesn't suck. YOU CAN DO IT!!! I KNOW YOU CAN!!!
Go forth, and paint.