We have posted a new tutorial on the documentation page which outlines the basic workflow for creating arbitrarily shaped clouds (including bunnies ).
The page also contains two download links for the MagmaFlow files used in the tutorial, but just in case I am attaching them here too.
NOTE: The previously posted CloudFlow2 did not contain the right flow (it was a duplicate of CloudFlow1). The new ZIP fixes this and also includes the SelectDensityZero flow as bonus.
CloudFlow2.zip (2.87 KB)