Only three days are left in iLounge’s Design the Next iPhone, Win the Next iPhone Contest, so if you haven’t yet entered, this is your chance. To enter the contest, simply submit a brand-new artistic rendition (minimum 1600px wide) of what you think the next iPhone should look like. iLounge’s editors will pick six top concepts from the pool of valid entries, three of which will receive Apple’s next-generation iPhone, while three…