One of the groups I participate on has started a monthly challenge block. Each month one of the members selects a challenge block and submits it to the group. Each member has the choice to participate or not. Of the ones who participate, at the end of the year, they will have twelve 9-inch blocks to use in a quilt.
This month's challenge block is the Alabama block. The block itself is rather simple and would be quick to make if you use a strip piecing technique. Here's a link to the block's instructions: Alabama Block - 9".