A lot of NL websites seem to have a forum dedicated to NL coaster projects that are being worked on, or are in route to the upload section.
So, basically, just post a screenshot of your new ride, or whatever, using
www.imageshack.us
Here's my latest WIP:
Atlantis-Tritons Revenge http://img74.imageshack.us/img74/356/triton1ti8.png
The colors aren't final, so it will be improved in the near future. And the track will be 100% handbuilt, unlike the rides I've been cranking out lately.