I had an idea for an item during my adventures... the stealth generator belt! It's function would be mostly an escape or espionage tool, with multiple possible power settings.
The main part of the belt is what it does to mobs. Depending on the power setting, it would cause mobs within a certain area from the player to not aggro, similar to playing in creative mode. A low power setting could shield you for, say, 10 blocks, and the highest might require bumping into an enemy to get their attention. Against players, however, it would have 3 settings: hiding the name (as if holding the 'shift' key), partially fading out the player, and complete invisibility. These settings should probably be easily modifiable by the admin, though, in case someone doesn't want it to be used for griefing.
My idea for the recipe is to have a two-part recipe with new components: a belt piece, made with 3 leather left to right, and a stealth generator, made as such:
Substitute glass for the fibre cable and lapotron crystals for the energy crystals
Then combine the two components. This could also open up all sorts of extra potential belts... utility belts for tool storage, similar to the toolbox, flotation belts for swimming... and other things people could think up.
Thoughts?