Although many of the world's blogs have their own individual designs and
color schemes, the majority run on just a few different software
platforms. These blogs look different from one another because the
platforms on which they run have the ability to utilize "skins" – files
that modify a blog's appearance by changing elements such as graphics,
colors and fonts. Popular blog platforms such as WordPress, Tumblr and
Blogger give you the ability to add a skin to your blog without
modifying your existing content.