Welcome!  I'm sure midrael will be by soon with an official welcome. The writers have a gallery just like the other artists.

http://www.renderosity.com/mod/gallery/browse.php?section_id=35&genre_id=

There are also challenges posted on the forum:

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2648217

http://market.renderosity.com/mod/forumpro/showthread.php?thread_id=2655212

Or you can start a a thread of interest to you and the other forum members will join in. It's a pretty quiet forum much of the time (especially on weekends) but we always welcome new members.

Hope you find something of interest here.