If you're the sort to buy multiple pairs of sneakers just to make sure your footwear is always fashionable, you might soon have a way to save a lot of money. David Coelho is crowdfunding ShiftWear, or sneakers that have color e-paper displays in their sides. You only need a mobile app to change your look at a moment's notice (there are promises of a shoe design store), and you can even use animations if you're feeling ostentatious. The shoes are machine-washable, and the e-paper consumes virtually no power if you're using static imagery -- there's even talk of walk-to-charge tech that would save you from ever having to plug in or swap batteries.