The thread needs to include at least three artworks: Those artworks can depict the same subject as long as they're not the exact same image. In the case of written works and poems, the thread must include at least three different works or works that together exceed 1000 words. If you don't have enough to create your own thread, there are several mega threads where people can post and share their work:
Rate My Art ///
General Sprites and Banners ///
Writing Thread ///
Music Thread