►MCPatcher is a java application that will allows you to switch between texture packs from one size to another sizes.
►There are a lot of features:
►Built-in utility for converting texture packs to resource packs 1.6.
►Better Glass. More transparency options for glass textures.
►Better Skies. Add your own textures to the day and night skies. Many options for fading and blending.
►Extended animation, mipmapping, and font support.