Draw several wide crossed lines with the Freehand and Brush tool, then Arrange >
Join Shapes.2 Convert Line to Shape (Arrange menu)
3 Apply a good amount of feathering using the Feathering slider on the Infobar (to the right of the Gallery icons).
4
Select the Shadow Tool and add a Wall Shadow with a blur
5 Select Convert to Editable Shapes (Arrange menu) and ungroup (Ctrl u
). Select the shadow only and select the Fill Tool (F5). Select Fractal Clouds from the Fill Type drop list menu on the Infobar.
6
Delete the original shape but keep the shadow. Select the Transparency Tool (F6) and select Stained Glass from the Transparency Type drop down list. Add a Wall shadow with 0%
Shadow Blur and with 0% Shadow Transparency.
7 Convert to Editable Shapes, Ungroup. Delete the object and keep the shadow. Select the shadow and click the red color
swatch on the screen palette.
8 Now you have the base object with which to create the fire brush effect.