Unstable Falling Blocks
Makes unstable falling blocks have a separate texture.
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Unstable Falling Blocks
This pack very subtly changes the texture of naturally-generating falling blocks that do not have supporting blocks beneath them.
If you want something more obvious, try Obvious Unstable Falling Blocks!

This pack is inspired by Ensis and ManuelXXVI, though my block model is set up a bit differently than theirs to make the effect as seamless as possible.