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More details here: http://novaskin.me/post/23756601535/texturepack
Create your own mob skins here http://mob.novaskin.me/editor/Start
Enjoy!
The layers tab has an option to change resolution.
The skin in the gallery work in the same way.
examples here
You can load the 0.25x skin using the "load" button, or drag the file ad drop in novaskin. The skin will be resized to 1x but at least you can see it.
But how do you manage to work with 0.25x skins when some parts in the default resolution are 1px? The cow "ears" for example
Also, I'm giving this topic an Up.