Dynamic creepers

Charged creepers already exist but they are extremely rare or manually replicated, the basis of this idea was the new abilities mobs like spiders gain in hard mode. The thought was that creepers would have a chance to spawn with faster movement speed and/or higher power explosions, these creepers would still be able to become charged and create a massive explosion. Along with this come some wackier ideas, such as the creepers blending into the background (I don’t know how that could be pulled off) or things of the like. The only way I can think of implementing this would be a hard mode exclusive and I think it would make the game that wee bit more scary. Thank you for the consideration.