I decided to start learning Houdini in my spare time (alongside my C4D journey), and have been loving the capabilities it provides for particles, grains, pyro, and liquid.  There's just a lot with those that you can't do in C4D. 

These renders were the results of following various tutorials, and using my own ideas for concepts, colors, layouts, etc.  Huge thank you to the creators who are willing to share their knowledge with others!