Any interior decorator will tell you, there’s a fine line between blush and bashful. Unfortunately for Aio Wireless, the same can’t be said of plum and magenta, at least not in a court of law. T-Mobile announced today that a Federal Court in Texas has ordered the AT&T subsidiary to stop using a “plum color as a central part of its trade dress,” as it is “confusingly similar” to its own trademark magenta.