How to make a flow block?

Question

Images

How to make this "spreading" block ( On the right side ) in Ps?
Or maybe somewhere in the internet these blocks are?
I tried to do it in flash using the "Wave" filter and using distortion. Did not work out.

Answer 1

using the pen tool

Answer 2

Learn Bezier Curves. Although, to implement such an example, special skills are not required.