http://www.toyotanation.com/forum/t20118.html
Please follow the following rules and you won't get your signature/avatar suspended by one of the staff:
Signature Rules:
1. Keep it under 5 lines.
2. ONE image per sig.
3. Maximum image size should be under 50kB, to be courteous to our members on slower connections.
4. Maximum image dimensions shouldn't exceed 500 pixels wide, and 150 pixels high. <--
VERY IMPORTANT - MOST COMMON VIOLATION!
5. No animations.
6. Keep text to under 50 words or so, it isn't your homepage.
7. No nudity or offensive material
8. No commercial/business/website promotion.
NEW!
9. The only URL's allowed in signatures are to your own car's personal website. This goes hand-in-hand with the above rule.
NEW!
Avatar Rules:
- No nudity or offensive material
- No commercial/business/website promotion.
NEW!
Conclusion: The purpose of signature/avatar is to
personalize your posts. With that in mind, it should be related to
yourself (eg. picture of your car) and not any business/company/website/funny link that you promote or vouch for.
...When in doubt, keep it simple.