Pixel Art Challenge: Dive In

From challenge winner fool comes an underwater challenge, so jump right in ;)

Create an underwater cityscape or scene (yes, SpongeBob inspired scenes are cool).

Rules:

• Canvas Size: 240x180 vertical or horizontal.
• Transparency: No
• Color Restrictions: 16

The challenge thread will have all the challenge updates. The thread is also a great place to post your WIPs.