To get one like this:
Post an image with the url:
http://bls.dulake.net/MD04/YOURUSERNAMEHERE (put your username where the bold text is.
For my server it'd be this

To get one like this:

You must make this an image that follows this format:
http://zapkraft.netne.net/tools/serverimg.php?ip=<YOUR SERVER'S IP HERE>&p=
<YOUR SERVER'S PORT HERE>&h=
<Your Name Here>
Finally, to get one like this:

You must edit the url to fit your server:
http://69.64.43.11/server-status.php?t=3&a=<SERVER IP HERE>&p=
<Server's port here> The parts of the URL you need to edit are bolded so don't mess with the other parts of the URLs. Don't keep the "<" or ">"s in the URL.
Blockland's default port is 28000, so keep that in mind.