If you have the same taste as me, you like the mac Icon better than the crappy windows one.
1. Download the icon.
Click
here to download.
If the download page appears to be just the icon, right click it and click "Save image as...", and then save it to you're desktop.
2. Changing the icon.
If you have a Blockland shortcut on you're desktop, which you probably do, right click it then click "Properties".

Then, a menu should pop up that looks like this. Click the "Change Icon..." button at the bottom.

A smaller window will appear. Click "Browse" and select the Blockland.ico file on the desktop.

And there ya have it! A new smexy icon for ya game!

Hope this Helps! - Zapk