itsaprilXD posted the following AMAZING news in the Mac forum:
We’ve had Postal for a while so we can change lot images for uploading to the Exchange but the only way us Mac users could change our Sims images, apart from doing it on a PC, was using Mono which involved doing stuff in Terminal which is always a bit scary. But here it is, Zinda’s Image Changer for the Mac. Zinda, we LOVE you 😀 You’ve just made it all a little bit easier for those of us on Macs, something EA have never even attempted – THANK YOU!
Link to Zinda – http://www.zindasgoldensims.com/
Just scroll down to the bottom for the download link.