I've been playing with a little retrofuturism lately and found myself missing a Bryce tool: Multi-Replicate. Similar to Array, Ring and Symmetry, it allows you to create instances of a single original object, but it lets you set the physical offset, scale and rotation for each axis. It also has a checkbox which will cause the scaling on each axis to be applied to that axis's offset. Video example of the tool here. Very nice for pseudo-organic forms.