Sometimes people like to upload to the exchange house's they did not make, my adive from this point on, would be to use the main uploaded picture 0x00000000 PNG file and start to signature sign your own work. If you upload to a website you might wish to replace the file 0x00000000 with a blank 512 by 512 png picture, this will go to some way in stopping people copying your work. Of course, people can always make a new cover shots, but it's not making it easy for them.
Feldynn I've not herd of anything like simpe for the sims 3, I read a comment that we are more likely to see a collection of tools rather than 1 program. I surpose it depends on the modders and how well stuff fits together.