http://design.tutsplus.com/tutorials/create-a-fire-and-rust-text-effect-using-the-flame-filter-in-adobe-photoshop-cc--cms-22492

The Flame Generator filter in Adobe Photoshop CC is a new feature that’s designed to render realistic flames on user-defined paths. This tutorial will show you how to style and texture a rusty text, then add some flames using the filter, along with some other smoke and sparks textures to create a vibrant flaming text effect.