Battle.net notes that today is the fifth anniversary of the release of the first part of StarCraft II, Blizzard's multi-part RTS sequel. Here's word on the celebration, which pulls out a few of the stops:

Fancy Decorations
To celebrate this special occasion, we’ll be releasing a fifth anniversary portrait to help players join in on the celebration. Just log in to StarCraft II from July 27 to August 3 and play a game to be awarded this special portrait commemorating the occasion.

Celebrate In-Game!
Additionally, we’ve decided to bring truckloads of celebratory virtual confetti to the StarCraft II universe for the anniversary. This confetti is only here for a limited time, and you can make the most of it by stepping up your economic harassment efforts in all your favorite competitive multiplayer modes.

We hope you’ll relish in the celebration that erupts with each worker kill you secure!

Additional Ways to Celebrate...
Once you’ve had some fun in-game, make sure you check out our Media section. We’ll be adding a new downloadable wallpaper there to mark the occasion.