You mean custom sprites? I love it too, I'm not a very good sprite-r but I seem to pull off a..."Decent" design.
The game will have all original sprites when it's complete.
Hopefully, (If my sprite-ing skills improve) It will look more detailed then games like box boy, the black-and-white blends with the game's design, atmosphere, story, and it's great because I'd never be able to make really nice looking graphics lol.