TheSims2.com - MySims
"I use the bodyshop mechanic to change both the lighting and poses of my sims.
When Downloading these tools be sure to unzip in the My Documents\EA Games\The Sims 2\Config\ folder instead of downloads.
1. Download bodyshop mechanic here-
2. Download lighting-
3. Download Replacement poses-
I simply use the prt screen and paste into photoshop to edit the backgrounds. I find high resolution pics for the backgrounds since those seem to turn out the best. I prefer photoshop since it allows me to use layers and not just one flat pic. If you have any more questions feel free to ask. :)
Hope that I helped.
Also I used this tutorial by Simfishwick to change my default upload picture:
Special Thanks to Dr. Pixel, Wes Howe, and Simfishwick for their wonderful contribution to the Sims"