From today (May 30th) till Tuesday, June 10th at 9:00 AM PDT, the Heart of the Valorous buff will be active. It increases all valor points gained by 100%, meaning that (as an example) a daily quest that grants five valor points will now grant ten - it's essentially double your normal valor point acquisition.
All you have to do to earn valor at this rate is log on and do what you would normally do to gain it - there's no special item or requirement. So if you're trying to gear up a series of alts, now's basically the time to get on and play them. You have until June 10th, so get started.