"Sponge Simulation" is my first project in Houdini ever. I tried following along a tutorial about grain simulation, but in the end I tried tweaking it on my own. Didn't really go that well, but hey, I managed to get a render. I see the potential in Houdini, but man, Unreal Engine and real-time really stole my heart. 10 out 10, will try again.
Final render using Karma.
Simulation in Houdini.