Available in 32x32, 48x48 and 64x64.

Corners are invisible while as an icon. And it looks a lot better.
How to install:
Right click your Blockland shortcut, click "Properties", click the "Shortcut" tab, at the top.
Then, at the bottom click "Change Icon". Browse for the icon that you downloaded, and double-click it. Click Ok. Ta-Da!
Download here.Constructive criticism would be helpful. Thank you!
UPDATE:

A view of the Icon in action.