Anybody can submit their art to the Creations page. You just need to go to the page and click the "Submit a Link" button. When submitting a Creation, make sure that it is a direct link—direct links for images end in a file extension such as .jpg, .png, or .gif—so that the Creation can be properly embedded (there is a preview window so you can tell if it embeds correctly). After submitting your Creation, it will go through a manual review process. The time this takes depends on how many Creations are in the queue for review, so please be patient. You will receive a notification if your Creation is approved but not if it's denied.