1. Login Blogger.com
2. Choose a design / Design>> Edit Html
3. Expand widget templates.
4. Find the code ]]></ b: skin> and place the following code before the code.
Ul # Label1, Label2 # ul {list-style: none; margin: 0 0 0; padding: 0 0 8px}
# Label1 li, # Label2 li {background: url (http://i894.photobucket.com/albums/ac148/fajrialhadii/folder-open-16x16.png) no-repeat; padding-top: 0; padding-right: 0; padding-bottom: 3px; padding-left: 20px; margin-bottom: 3px; border-bottom: 1px dotted # 063E3F; line-height: 1.2em}a
5. When finished select save template and see the results.
hopefully useful article how to add icon next to the blog labels link those in need.