Few days ago I've created my Envato account. Envato is a great site where you can sell your, ...let's say 'art". Envato consists of 9 different marketplaces. For example GraphicRiver, where you can sell your graphics, web-elements, flyers, etc., on AudioJungle you can sell sound files and music, on PhotoDune you can sell your photos, on ThemeForest you can sell webdesigns, and so on. Envato Marketplaces are also the great place to buy graphic, video, audio resources. Everything is going through reviewing process, so you can be sure you'll find only professional stuff there.
You can register for free in few minutes, but if you want to become a contributor, you have to pass a simple test... (I know, it's cheating, but you can find answers on Google). After registration, you can start selling.
Here are links for each marketplace:
GraphicRiver (2d graphics, paintings, print media, vectors, etc.) - [link]
ThemeForest (webdesign, PSD templates, WordPress templates, coded designs) - [link]
PhotoDune (photography) - [link]
VideoHive (motion graphics, videos, resources) - [link]
3D Ocean (3D graphics and resources) - [link]
AudioJungle (sounds, music, resources, etc.) - [link]
CodeCanyon (apps, programs, codes, html, resources) - [link]
ActiveDen (flash and Unity 3D) - [link]
Tutorials (Tutorials Marketplaces) - [link]
Check it out. You will definitely not regret it.
If you have any problems, PM me.