Rock formations... set up

[blitz99]

do you all use a plan??? do you say "ok, i want to make it look like a "U" with two sides coming out and the middle recessed"?
or, i want to do this and that with my rocks.... or do you just start stacking and seeing what fits?

 

[powdertoastman]

its kinda hard to decide before hand how you want it to look, it never turns out how you want. i just start stacking and if i dont like it i redo it.