Lol. No you can't freeze your bud to make it purple. What you can do is keep the temp in your grow room nice and cool. Like 60-62. Your plants may turn slightly purple. Some strains actually come out purple people...Jesus. He wasn't trying to say this purple is the best...just showing off his good. Stop being bitches.
Also. Never freeze your weed! Ever. Ruins it. Keep it in jars. It can keep for at least a year with proper opening and stirring.