We have 2 levels of membership: Members and Contributors. Contributors are like Members, except they can also vote on new submissions. Everyone is encouraged to join as a Contributor and help vote on new submissions. If you are already a Member and wish to change your account to be a Contributor, all you need to do is leave the group, and then re-join.
For an explanation of what a seamless texture is, read here: blog.spiralgraphics.biz/2010/0…
Please read carefully the author's notes on each seamless texture to see if and how you are allowed to use it. If you are not sure whether a certain use is OK, then contact the author for clarification.
Only submit textures that are seamless, can be used in projects (at least noncommercial ones), and don't suck.
If you use a texture you found in this group, please give this group and the author credit.