A 64x64 (pixel) .png icon
Uploading the icon:
- Enter the Multicraft control panel and select the server you want to add an icon to.
- Enter the 'FTP File Access' under 'Files'
- Stay in the main directory
- Click the upload button
- Upload your image
- Rename the file "server-icon.png"
- Restart your Minecraft server
If you followed all the steps correctly, you should now see your server icon in the server list!