How to change the look of the standalone bar?

Why do all the TLB skins in the skin library show different looking toolbars?

I know at least two ways to change the taskbar/toolbar appearance: WindowBlinds and custom visual style.

Anyway, is there any way to make the toolbar transparent (glass effect) without making the icons transparent too? Like in the menus?

The standalone True Launch Bar supports the transparency option. Right-click the empty space of the toolbar and select "Toolbar Properties". Use the Translucency slider to set the transparency. Also I can recommend to select the toolbar style as "taskbar" to remove the big borders arround the toolbar.