Can You Alter The Contrast Of Toolbar, Sidebar Icons?

Especially in Mail and Safari. With the grey background of the toolbars and sidebars themselves the icons barely stand out. In Firefox most ot the toolbar icons are fairly bold and easier to see, but in the native Mac apps they are so dull it's difficult for me to make them out. I don't have a machine in the house that still has Snow Leopard to compare but it seems to me that all the icons got smaller and lost whatever color or contrast they had. Besides the current glitches in the OS I really don't like the look of the applications as they are now. The only things that stand out and are easily visible are the three red, yellow, green window buttons.