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for this animation I used the ocean modifier and added a shiny porcelain like material to the resulting mesh

you can download the blend file here

starting with blender 2.72 freestyle can be used in cycles too, without having to use tricks like layers with different renderers. Unfortunately there is no freestyle pass in the render layer anymore, so we can´t use the line drawing of our scene in the compositor as easy as with the blender internal renderer. (by the time of writing 2.72 is not yet released - so currently I'm using 2.72-RC1 to create the screenshot)

what we can do to separate the lines and recombine it in the compositor is render it on a separate render layer.

for this animation I've used a Turbulence force field to whirl some no gravity dissolving smoke around. you can download the blend file here

This animation was created by accident. I played with the new smoke/fire material of the object/Quick Smoke menu in blender 2.72-RC and accidentally set one of the parameters to -2. I have no idea how or why this works but its definitely worth exploring further.

you can download the blend file here

For this animation I used a build modifier on a cube and added a depth of field effect.

you can download the blend file here

I used a mesh from an extruded curve and a boolean modifier to create a glass cube with a intertwined pipe and filled it using the fluid simulator

you can download the blend file here

This animation was created using the blender 2.72 Testbuild, using freestyle and cycles to create some construction drawing like lines.

you can download the blend file here

For this animation I used the blender testbuild for version 2.72. To my delight you can use freestyle with cycles without any layering or scene tricks.

you can download the blend file here

For this animation I used a fluid simulation without gravity and a spherical obstacle. Then I used a smooth modifier to get rid of all the wired artifacts of the fluid sim

you can download the blend file here

For this animation I used a paticleset using fluid particles and metaballs as particle objects

you can download the blend file here