FlipWatch is a mod, which adds a few blocks, that can change their statement with redstone. Mod adds for now is 4 blocks. You can build custom maps with it, to make doors in your world.
Blocks:
Red FlipWatch - changing its statement with a redstone power. Have 2 statements: solid and walkable-through.
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Blue FlipWatch - same as red one.
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Green FlipWatch - will boost your jump height.
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Nuar FlipWatch - on a right click will grant a levitation, and also could change statements.
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Items:
Red Switcher - switches red FW blocks.
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Blue Switcher - switches blue FW blocks.