GLUE GUN: when shot on to an item it creates a blob of glue and after that you can attach another item to that glob! My example would be firework+bomb or just to make pillow crafts like robot monuments!
STICKY BLOCK: when attaching an item to it, it can be thrown to disorient players (up to 3 spots) and when thrown all items activate! (Ex: if firework is attached and a bomb is attached, the glue block activates those when it lands making the firework in question not useable with the sticky block)