How would I make objects have a transparent wireframe as a placeholder for unfinished sprite art?

Unity Engine
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Let’s say an area is supposed to have a tree. But my artist has not yet made a sprite that I can use yet, so instead I want to have a placeholder that will look decent in my world without making me want to gouge my eyes out.

The way I figured I would go about it would be something like:

  1. Create a completely white outline and fill of a tree in photoshop, and then import that into Unity
  2. Create an acceptable looking wireframe in photoshop—something like black lines with transparent space between them and maybe a little shading to make the wireframes look decent
  3. Create some sort of material that I can attach the wireframe that I made in photoshop
  4. Attach that material to whatever completely white/blank object I made in photoshop (tree, crate, monster, etc.)

This seems really straightforward for me but maybe I am just getting confused at the material part. I keep running into trouble here and it never turns out right. Which type of material shader would I use? How do I properly attach it to my sprites?

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