I like the design of Cheeta and how she almost crossing that 4th wall, by interacting with her base. 

I like the Bowen/Maddox sculpt of Kitty Pride for that reason, she's phasing through her base.

I'd love to see other sculpts like that, maybe a caped character - perhaps a Batman statue do something like that, like a Bill Skienkivitch (spelling) or Mark Texera design with that "living" cape that flows everywhere and over the base but also over the edge of the base onto the shelf the statue sits on.  That would be cool.

Yes -- I actually have that, too -- forgot that one.  But the Batman image in my head is more of the cape flowing down from Batman like a waterfall, hitting the base at almost 90 degrees and flowing horizontally over the base, down the edge of the base and 90 degrees on the the shelf.  It would look silly on a standing Batman, since the cape would seem too long -- but maybe on a Batman perched on a Gargoyle, where the length on the hanging cape is longer than the distance from Batman's head plumb-line to his feet (since he's kneeling).

Another cool one would be a Hulk throwing a piece of rock that has been ripped from the base like a piece of pie.

The notion always being to push that 4th wall barrier.

Although I don't have any statues, busts or such there are a few statues I would love to see.

The Celestials!

Large scale similar to the large pieces I've seen of Galactus.  They would look cool!!!

How about someone commission a Galactus vs. Celestials?