https://github.com/appsandwich/UIImage-ASImage
Last week I discovered that it was possible to load unbundled images using the iOS [UIImage imageNamed:] method:
Interesting. I didn't know that you can use [UIImage imageNamed:] (and its caching benefits) for non-bundled images: https://stackoverflow.com/a/2324544
I've since created a UIImage category that allows you to easily drop in the code into any project - available here on Github.