Write to script to iterate through packed sprites

I'm using Unity 4.7.2 and I need to iterate over a group of rectangular images quickly. I've been using Texture Packer and the Sprite Editor in Unity to create a packed Sprite image containing 10 fuzzy images...

I need to be able to access the resulting Sprite via a script where I can iterate over the packed images separately. Is it possible to do this and will this be more efficient than loading and displaying each image separately?