I wanted to challenge myself to try to make a shader that utilizes voronoi noise to draw a pile of coins – and this is the result. The main shader which draws this material is made up of a series of layers of coins, which are node groups that can be chained together, along with a base layer that fills in the gaps.

Theoretically, you could do layers and layers of coins all the way down, but I opted not to do it that way, since you can hardly see the difference most of the time anyway.

The coin color is built into the shader/node group, but it can easily be changed by editing the color ramps in the Coin Layer and Coin Base node groups.

Here’s the same material with the Mask Modifier set to use vertex colors, and some gemstone particles (included in the Blend file).