http://www.minecraftwiki.net/wiki/Potion_effects This (^^) apparently is already coded into the game and works in 1.8. I'd really like to see someone take advantage of this. I'd do it myself but last I checked I didn't know java. My ideas for this was: -Have signs where users can buy the ability to use a potion (with gold ingots or iconomy creds or whatever) -To use a potion, you right click while holding a bukkit of milk and whatever potion effect they bought from the sign is applied. I don't know about balancing. Maybe you can only "hold" one potion effect at a time. Or maybe you designate what kind of potion you want to have "active" and each time you use it, it takes away the money. Thoughts?