The Bunny Wuffles School of Sims Transmogrification

http://www.strategyplanet.com/thesims/sas/bwsost/bwsost.htm

Here's a great site with helpful information about using The Sims Transmogrifier:

Here, I offer complete step-by-step tutorials in the first principles of object making for the complete novice in both Adobe Photoshop and The Sims Transmogrifier, and some special guest tutorials - one off tutorials in specific tasks - not necessarily Transmogrifier - written by guest tutors, along with some masterclasses on key skills in Photoshop & TMog and some stand-alone workshops on specific tasks for complete beginners to TMog which improve gameplay. The workshops assume little or no previous knowledge in either Photoshop or Transmogrifier, so as to be of use to you whatever level you are at.

One thing I have learned is that different people use different methods in their object making. Some know short cuts that others don't; some use different programs or sources of textures to others. These tutorials show the way I make my objects, and as soon as I learn a new skill, I am anxious to pass it on! But by no means am I trying to imply that these are the definitive and only ways of making or amending objects; just an easy way to start off.

The tutorials have all been tested by people with no previous experience in the skills used to complete success - in fact, the first brown chair one was written for me when my flamingo was still safely pink and my unopened copy of Photoshop 5.5 was covered in long gathered dust and woefully out of date.

Finally, my tutorials are really meant to be done in the same order they are presented as I often refer back to skills learnt in previous ones using terminology I introduced in them earlier. A brown chair may not be the most exciting thing in the world to you, but doing that tutorial will teach you how to mask off parts of an object while colouring another - an essential thing to know!

Great stuff! Lots of cool tutorials for beginners to masters, and links to useful resources.