If you can find the color flames you want, consider scanning them into your computer. Then size them for the area(s) you want and print them out on water slide decals. The decal paper is available from Bel Decal
http://www.beldecal.com/ and is available in clear or white background. The paper runs ABOUT $1.00 per 8 1/2 x 11 sheet. I do decals all the time this way, it is not hard and the decals work very well.