Redstone blocks in Minecraft

What's the best thing to use for an area build made of redstone blocks? He's a list of redstone blocks that could be used to decorate the area.

Dispenser
Note Block
Powered Rail
Detector Rail
Sticky Piston
Rail
Redstone Torch
Redstone Lamp
Redstone Block
Activator Rail
Dropper
Observer
Redstone
Compass
Clock
Redstone Repeater
Redstone Comparator