Texture packs in-game

What if in the menu with the play, options buttons there would be another called Create a texture pack ? That would be a button redirecting you to a screen where you have every textures and you can edit them and if you're not glad you can press the Reset button to put the original textures. Like that textures packs are editable by everyone and you can even keep them for you only, you can after play with the texture packs and change them if you're not really glad of what you've done.