I know I can use CSS, but I haven't fully learn't CSS yet. Is there no feature that will allow me to do this ? >.<
Lol.. that IS your feature that allows you to do it.
No there are no OTHER (easy) ways to do this. Furthermore, even the CSS stuff... being a very simple implementation... is also very simplistic in its change, only affecting the color and some of the basic 3D elements.
There are no other programmatic ways to change the browser scrollbars, aside from creating code that must be installed on each computer that modifies the browser itself. That's not a simple change by any means however, and would require each user of your site to modify their browser with an install... something almost no users would choose to do.
You DO have another option... that is to make a Flash based site. Then you can make Flash-based scrollbars that look any way you desire. However, once again you must know how to use Flash... AND your site content would be static since Flash is not integratable (SP?) with PHP... only XML.
Your only other option is to create a set of images that you add script to so that when they are dragged around the screen, cause your content to scroll. This however, is a bunch of scripting, and not REALLY worth the effort. It is doable, but there would be so much scripting necessary, I wonder if it is worth it?
If you don't know CSS, I doubt any of the alternatives are within your abilities to do so.