Change+Color+Using+Shape+Tween

NOTE: All of these steps must take place on the same layer. You have to name the layer. Example: Blue circle On the layer 1, draw any shape you want.

Then right click anywhere on the flames and insert key frame.

Select the shape that you draw and change color.

Choose subselection tool on the side bar and select layer 1.

Look at the properties tool bar and change tween to shape.