A logo gives your wiki its identity. You will need to make two logos for your project: One for the Monaco and other older skins (which most users will see), and another for the Quartz skin. Create your image in any image editing software (Paintbrush, Paint Shop Pro, GIMP, Fireworks, Photoshop, etc.)
The logo has to be no more than 135 pixels wide and 155 pixels tall, and should be saved in the .png format with the filename Wiki.png. If you need inspiration, check out the logos of Wikia's popular wikis. If you would like help designing or creating a logo, please describe what you'd like at the Logo Creation Wiki -- we'd be happy to help!
To upload your logo, click the "Upload file" link and save your logo with the "destination filename" wiki.png.
Find out more on Help:Logo.