Visit Penny in the Nexus, or click "Shop" in the top of your screen to shop for a brand new Skydome for your Worlds.
Next select the Skydomes icon.
Here you will be able to purchase a Skydome for your Worlds! Click on "Friends" to see which your friends have purchased, or on "Mine" to see which you already own.
A new Skydome can turn a cutesy forest landscape into a whimsical fairyland or a spooky swamp. The sky(dome) is the limit!