Large glowing mushrooms such as you might find in a hollow-earth-cave concept, sci-fi, fantasy, etc.
These are meant to be large scale, such as the scale of a house or a tree, but can also be used in medium-small applications.
Glow can be controlled by setting the Emission value on the material.
This is a Unity 3d asset and can be purchased on the asset store.
See rotary previews below.