What carts are you wanting to reproduce labels for? I have a complete collection of Activision standard carts, so I can work on one for you. I can get text placements just fine, but the artwork would be quite difficult to reproduce. My labels are hardly clean, as they suffer from those dark spots, or "Acti-Plaque". Maybe you're looking to put clean labels on them for that reason?
I've been working on some covers for myself, so I've got some stuff to draw from.