Corona Edge Shader lets you have gradient like texture around the open edges (borders) of geometry.

Distance near - Controls the width from the edge until the start of the gradient.

Distance far - Controls the width from the edge until the end of the gradient.

Level - Determines the edge color strength.

Color - Controls the color or map spanning from the actual edge (border) until "Distance near".

Texture - Overrides near or far color slots with the use of shaders or bitmaps.

Mix mode - Controls the blending mode between the color and the texture slot.

Mix strength - Determines the mixing strength of the color and the texture slots.

Enable near/far distance mapping - Controls the gradient interpolation between near and far distances.