I would suggest that you look on the net for your bulbs, Not sure if it is safe to color bulbs using some off the shelf paint ect. I would be worried that it would cause some sort of fire hazard. Just do a search for colored bulbs and you will find what you are looking for, I found 40W colored that are perfect for my up lighting set up at around $2.50 ea. That was less than I can buy a full sized flood for.
PMT