My advice this week (inspired from the Big Mac turning 40): celebrate the anniversary of your product or service!
It doesn't matter how much candles there is. The importance is to talk positively about your product and this is one more perfect reason. Anniversaries also humanize your product.
There are many different ways to celebrate the anniversary: you might just sent a special brochure reminding all the advantages of your product. Or better, you migh organize a party to celebrate the anniversary with your best customers and hottest prospects.