Creating Blue Flames
Step 1
First, create a new document with the following settings. The size (width and height) can be variable, but make sure you keep the resolution at 72 in order for all the filter effects and transformations to work properly.
Step 2
Reset your Foreground/Background Swatches as shown below:
Set the Foreground Color
R = 5; G = 70; B = 115
Set the Background Color
R = 195; G = 222; B = 240
Filter -> Render -> Clouds
Filter -> Render -> Difference Clouds (x2)
Image -> Adjustments -> Levels
Input Levels = 24, 1.00, 232
Filter -> Distort -> Polar Coordinates
Options = Polar to Rectangular
Layer -> New -> Layer via Copy
Set the Blending Mode of this new layer to "Overlay"
Layer -> Merge Down
Layer -> New -> Layer via Copy
Set the Blending Mode of this new layer to "Multiply"
Layer -> Merge Down
And here is the final result: