How do I change/modify my Windows Vista task bar to look more like these:?

Here are two examples of how I would like to change the appearance of my Windows Vista desktop task bar. It would be awesome if anyone could help me out on how to do this! Thanks!

http://i15.tinypic.com/82×8azd.png

and

http://farm3.static.flickr.com/2269/2082111407_2275cfef99_o.png