There was one for sims 2, and you could open any package file and clone it, and then adjust things like price, environment score etc. It was also how you could recolour things for sims 2. You had to open them in the package editor (PE) and then export the images, and use something like photoshop. I don't know what the ones for sims 3 are like - they all look too complicated to me. I mostly only used it for sims 2 to recolour things (and make some replacement colours too for a medival theme).