The Gullwing Twin Wind Towers may be one of the most ambitious skyscraper designs you will see this year. These towers were designed by ARXX Studio to run entirely off of wind power generated by wind turbines placed on the towers.
If a skyscraper made and powered entirely by its own wind turbines isn't ambitious, I don't know what is. The Gullwing Twin Wind Towers are planned for Dubai, a country which has served as the breeding ground for incredible skyscraper concepts.
Turbine Mega Towers
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92 Super Skyscrapers & Towers
Death Star Super-Structures