YarnBomb is a plugin that makes an explosion turn blocks into wool with the same colour.
Currently the only feature is the /yb command which does this, but future updates will make this happen on explosions with TNT and creepers.

Extract everything from the .zip file into you plugins folder, then open the woolColour.yml if you want to change any of the configurations. randomwool - if set to true will just replace blocks with any wool colour randomly instead of using the predefined ones.
All other lines are set up in this way
BlockID: WoolColourID
Just edit to your heart's desire.
0 Regular wool (white)