This package will theme all of the stock icons and also a number of JB tweaks (as shown in the preview).
To install, download the .theme file, place it in /private/var/stash/Themes.XXXXXX/ and enable it with Winterboard. Drag the theme to the top in Winterboard (above Zanilla) to ensure that all the icons have the same shape.
Note: some JB tweak icons have to be themed manually. There is a guide included in the .theme folder.
If you want to theme the Settings icons for App Store apps, just place an appropriately named 58x58 icon in an appropriately named bundle (so basically like theming the normal 120x120 icons, but using 58x58 icons instead).
If you like having a clean Settings.app, please consider donating
My PayPal address is firstname.lastname@example.org.
Credit for the original Zanilla theme goes to PointVision
Credit for recompiling the .artwork file goes to Jato_BZ