enchantment room (close-able with sticky pistons)
nether portal room (fancy design that pours lava falls when you step on a pressure plate when you enter
mob grinder (monkeyfarm's mob's on demand spawner)
mob arena (sticky pistons release the mobs when your ready to go)
underground base (can only get to with a rail system)
strip mine (with a rail system and storage cart system)
storage room- (with fancy decoration setting blocks that come out of the wall like generikb's)
melon farm - automated
animal barn - automated
tree farm - automated
Timed doors (eg. Press a button, come back a minute later with the door open)
One way doors (Using pistons on the floor level, a 1x2 corridor, and a pressure plate next to the piston)
Falling sand puzzles (Using pistons to push/pull sand blocks just like the crescent blocks in LoZ: OoT)
Long distance redstone networking (eg. Arrays of redstone dust across tens of chunks)
Rollback Post to RevisionRollBack
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Ideas I would like to see in vanilla Minecraft: 1) A grinding machine — similar to a furnace, but breaks down items like a leather tunic into pieces of leather. 2) Recycling — the ability to smelt metal tools and pieces of armor back into their respective ingots. 3) A hammer — used to break down cobblestone into gravel, and gravel into sand. 4) A study — a work bench that takes an enchanted item and a plain book to extract enchantments at the cost of experience.
Well, OP didn't specify whether this on creative or survival, so... TNT CANNON! Bring down a mountain, or make DIY ravines! The possibilities are endless. For extra 's, design your own cannon, rather than getting a design off Youtube.
I doubt there are 101 things with redstone, unless you start listing every latch and flip-flop.
Wrong. Of course there are over 101 things to build with redstone. Now, I'm not going to go to the effort, nor do I have the time and patience required to make a list of them, but just think logically about it. . . There's an endless variety of contraptions that you can create using redstone. No offense intended.