As you’ll recall, we recently introduced new formats for AdSense ads. This week, we’ve added a new dimension for publishers in customizing these ad formats. You’ve long been able to customize the size and colors of your ad units; now, you can also customize the shape by selecting between square, slightly rounded, or very rounded corners.

In terms of Google AdSense implement, the following variable will be added to your ad script depending on the version you select:
- google_ui_features = “rc:6″; [slightly rounded]
- google_ui_features = “rc:10″; [very rounded]
- google_ui_features = “rc:0″; [default, square corners]
Probably the rc: numbers indicates the pixel radius.