This is how I did my last batch (a bit more basic than the plog-example Talonz gave you above):
1 - Prime with Skull White Spray.
2 - Paint the inside of their "mouths" and "hands" black. Be carefull Not to paint any of the flames black though. Drybrush the black parts to make the "teeth" emerge more clearly - mostly to make it easier actually painting them at a later stage..
3 - Paint the flames Sunburst Yellow.
4 - Highlight flames with Orange going up to dark Red colors. Painting the fire is the tricky part - to make it realistic it needs to be highlighted backwards with the brightest spots in the recesses and vice versa.
5 - For the body pick a wash (any color of your choosing) and apply that in layers where you let it dry between the takes. Be patient with this, apply just a little bit of wash each time. Whatever color you Start with is gonna be the dominant one, but after that you can for example add a layer of Green or Purple ontop of Blue wash for a nice effect. 3-4 layers of wash ought to do.
Here's a link to my painting thread on this Forum, with the result:http://z7.invisionfree.com/wyrmling_x/inde...pic=8229&st=105EDIT
Oh yeah I forgot.. If you want to really follow the way the Flamers are painted "on the box" you need to do that "white shading" around their bottoms.. It's fairly tricky to get good-looking IMO. Smoothing out that 'edge' between the body-color (blue forexample) and the white can be a real headache..