The app is simple to use enter the text you want to appear in icon and select the background color, it will generate the icon automagically. Click on the Create icon to save the icon to your desktop. It generates 4 icons with variable sizes in PNG format, 128×128 px, 48x48px, 32x32px and 16x16px.
If you like to use it as Favicon for your blog you can convert this png image to Favicon.
Download Icon Generator, via Ryan Stewart