Double-posting for new info:
I have opened the gallery up to all members. We're a small community so I don't see a problem with hosting our own works here. I'll be adding directories for you to put your fanworks and original creations in soon. I'll also be adding a folder for members to post our favorite non-ATLA and non-Korra related memes and macros so that we can share the lulz.

Be advised: I've set both file and physical size limitations on uploads.
If we get a lot of stuff coming from bigger fandoms like Star Wars, Harry Potter, Star Trek, etc., then I can create a directory for them to keep things organized. (Loopy, you can take Star Wars, and I'll take Star Trek.

) (So many Red Shirt memes...)
Two rules (for now):1) Do not post others' works into the gallery. It is there for you to post
your creative works.
2) No porn. To be clear, porn is defined as posting sexually-explicit works like penetration shots. Nudes aren't porn. Two people lying naked next to each other with the implication they've had / will have sex isn't porn.
Recommendations:
Because I've set upload limits, the safest bet would be to post a lower quality pic, then comment with a link off to your art page or blog where the HQ pic can be viewed. This is a great way to lead people back to your main creative hub(s).
Also, please do everyone a solid. If you're posting popular memes or other such infamous things, make sure someone else hasn't already posted it.