Simply just adding a border of a different colour to a shape in edit mode It's incredible that I cannot seem to find a way of just simply colouring in the edges/verts differently to the colour of the faces of the shape. It ought to be simple right? And then... being able to just raise the thickness level on the line of the edge...


How do you do it?
I see at least 3 solutions. Note that if you want no shadow on your yellow, use an Emission shader:

1/ Create edge loops close to your angles, and assign your yellow color to all these edges.

2/ Duplicate your cube and give it a Wireframe modifier. Play with the parameters to increase or decrease the thickness of the wireframe.

3/ In Photoshop, create a picture with a blue square and yellow outlines. In the UV/Image Editor of Blender, open this picture, unwrap your cube and give it a material with an Image Texture node, with the cube picture as the image.