Blender is a great application to have some fun with.  I recently discovered the program and taught myself the basics using online tutorials.  It is a lot of fun especially when you find something you like to design and just go with it.  Get a few intro tips from one of the many blender Tutorials, Give it a try is free, great fun, and a useful tool.  Here are a few of my simple creations I used to teach myself:

Fluid Hall

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Fluid Hall Simulation

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Fluid obstacle Bowl

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Cubes Arrange Through

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