These are just for fun, I don't actually put labels on the beers, just come up with label I would put on them. I use GIMP so it is xcf format native and I save down to jpg to post online. They are a little bigger than the label printed would be because it fits my screen better, I'd scale down to 6.5-7 inch wide.
GIMP is like a free Photoshop program that uses layers, once you get the hang of it, the possibilities are unlimited.