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I think for both of these, the answer is the loose end of the rope above the statue/boulder would rise, but it wouldn't pull anything up. It just extends whatever the free length of rope might be, and that's it.
I think that's fine. Or the DM could rule that a rope that can't become perpendicular automatically causes the spell to fail.
I'm not big on "creative" spell use. Spells already have so much utility that allowing spell casters to get creative with them is just gilding the lily.