9to5Mac has pointed out that some creative developers have put together a one-click solution for those who aren't comfortable cracking open Terminal and changing system level settings, the app is called Lion Tweaks.
First you will need to download and install the Lion Tweaks app. Once it is downloaded and unpackaged, make sure to move it into your Applications folder. If you don't, the app will alert you to move it to the Applications folder, or else you may see some issues.
From here, it's as simple as selecting Yes or No on any of the settings you would like to change. Ranging from making the invisible scrollbar in Lion permanently visible, revealing the Library folder, to removing animation from some apps such as Mail.
Below are some examples of the tweaks in action:
The 3D dock (top) can be changed to a 2D dock (bottom), similar to that found in Snow Leopard.
For some the leather look of iCal in Lion is a great change, for others it's a bit too much. Lion Tweaks gives you the option to change from a leather to an aluminum appearance. (The same change can be made for Lion's Address Book).
There isn't an option in Safari Preferences to remove the Reader icon from the browser. With a click of a button you can remove the Reader icon from Safari in Lion Tweaks.
The tweaks shown above are just three of the 17 total tweaks possible with Lion Tweaks.You can always reverse a tweak by running the app again and selecting No.
Pls Take Note: some of these tweaks can and will change the behavior of some apps, not just appearance. When tweaks like those made in this app are made, they can sometimes create issues with the app(s). I strongly encourage you either have a Time Machine backup or create a backup of the app's package before making any tweaks should things go wrong.
If something does go wrong, you can always restore the backed-up app package--allowing you to either try again or retain the stock settings.