If you think that the designing-with-algae meme still has some mileage left in it and that algae as fuel isn't a disaster waiting to happen, then consider entering The 2011 International Algae Competition. There are three categories for which you can submit an entry.
Algae Landscape Design: How will algae production be integrated into future landscapes and eco-communities and what will they look like and how will they work?
Algae Production Systems: What are the best designs, engineering and systems for algae production to work effectively and economically on a community scale or distributed model?
Algae Food Development: What will be the next algae foods and recipes and the future uses of algae as food and feed ingredients that will transform our health and our diet?
Registration closes 11 September 2011, after which you have until 11 October 2011 to submit your entries.