You should check out Artisan...modelling plugin for sketchup. I think it's going to be a help dealing with curved surfaces (TINS). I dont' know any "easy" way to generate that stuff you showed.
the only thing I could say is that if it's just "eyecandy" and no bearing on reality...you could just make various curved amoeba shapes...extrude them up. Stack a bunch. Generate various curved surfaces on more-or-less vertical plane...and then intersect them with the flat extruded shapes you made. Delete the extra stuff and you'll have some odd 3D shapes.