Signature Pictures are now once again allowed.
Currently the rules are as follows.
1. Max Width: 500 pixels
2. Max Height: 100 pixels
3. Max Filesize: 80KB
4. No Pornographic or inappropriate images of any kind.
failure to follow rule #4 will result in you not having the ability to use sig pics or possible even being banned.
Update: You can now upload your signature to nfscars by going to your usercp and clicking on Upload Signature. Please read and follow the rules.
And due to the recent problems with remote hosts and the signature validator not liking alot of remote image hosts you can only use nfscars image host for now on.
You can also read more infromation here
on how the new signature validation system works.