How do I make a valcano out of the treats. & how would you make lave flow. use melting frosting & coloflow??

Would marshmallow fluff work for lava? What if you used the strawberry fluff that's already pink and add some more red coloring to it. Then heat it up a bit before pouring it where you need it. I have a feeling that would flow like magma.

How big do you need the volcano? I did this one out of RKT and coated it in chocolate. The lava is fondant.