Insta Boom by AKTheKnight
Gives creepers a chance to instantly explode when they are attacked by a player.
Instant Blocks by Slymask3
This mod adds 11 new 'Instant Blocks' to the game. These blocks could be obtained by crafting, from the creative Instant Blocks tab, or from dungeon chests, village chests, etc. Each block generates a different structure upon right-clicking on the block with an Instant Wand.