Since my awesome alt account was banned, I now offer you all the Darkness Challenge. This uses dark colors and low saturation to provide an air of mustinold and strangelity.
The Deluxe Palette: Beauty with a cost
You can use this upgraded palette with 15 more colors at the expense of 4 votes. That's right, four votes that are given to your pack won't count. It's the cost for having more colors.
The rules: Only use pixel art, so no using brushes to blend colors. You must complete the entire terrain.png and all three chests. Nothing else is required. The deadline is April 2nd. On that date, a poll will be held. Your submission to the poll will require the terrain and exactly three screenshots showing off the pack.