We thought Mango's nectar was already pretty damn sweet, but a group of young developers recently took up the challenge to make the next generation Windows Phone 7 experience even more delicious. Following up on last year's 'Rockstar' competition, Microsoft asked students to submit Mango app prototypes via Twitter, with the promise of developers phones for the top entries. Among the top 20 #WPAppItUp submissions are a program that helps the colorblind figure out what shade of puce they're peeping, and a sadistic alarm clock that requires users to solve puzzles before hitting the snooze button. Apparently, Microsoft still has 30 Windows Phones to give away, and is looking for young devs to offer up America's next top Mango app. Submission guidelines can be found at the source link below.