Impression themes, one of the best looking community themes in Ubuntu get a makeover in Maverick. The themes make nice use of colors used in Ubuntu Branding i.e aubergine and orange and feature a slimmer scrollbar.
How long u have been using Ubuntu?? If you are using Ubuntu for a long time now and have had your hands-on many Ubuntu versions, then 'Ubuntu Artwork Archives' is an excellent place to take a journey down the lane and see Artworks for your favorite versions.
There was a really annoying bug with Rhythmbox in Maverick which let the music player to terminate whenever a user clicked on the close button. I too, out of habit from Lucid used to click on close button and the music player would go off.
Gnome Slideshow Background XML creator lets you create an xml file from pictures in a folder that create links to all your pictures. Just add the xml file to background tab in appearance window and you are done.
Faenza Icons set has been hugely popular and every other day I see some new fan made Faenza inspired icons and mods. Faenza Dark Mod is a fan made fix on the similar lines that fixes Faenza-Dark icons to look better with dark themes.
Cairo Dock has come up with a new beta version in its development series 2.2. The new series aims at bringing lots of fixes, performance optimizations and new features. Highlights of the new series: