We’ve seen some transparent mods of popular Android apps before, but you have to check out the latest from XDA member fenando sor. He has been doing theming apps for over a year, and his latest includes transparent themes for Gmail 2.3.5, Google Voice, the Market, Pandora, XDA app, and Facebook. You will also find colors in addition to the transparent versions which include blue, cyan, orange, red, pink, emerald, and black clear.
Hit the application thread for downloads links and instructions. One more pic after the break.