Some stuff to download and diddle with.
Second Life
SLGUITransparent - Slightly modified colors.ini file, this will leave the colors basicly the same as they are defaultly, but make the GUI transparent so you can see through it. I did this after being annoyed that the GUI kept getting in my way. Note: It can be difficult to read text on light backgrounds because of the transparency.
Steps To Install: Right-Click the link above and select Save As... (or Save Link As...) and save it wherever, then open the text file in the text viewer of your choice (Notepad for example) (or skip these first steps and click the link which should give you the full text), Ctrl-A, Ctrl-C (Select All, Copy), then go to C:\Program Files\SecondLife\app_settings, open colors.ini, hit Ctrl-A, then Ctrl-V (Paste), then save colors.ini, if SL is open you will need to relog (I have no idea how to do this on a Mac or Linux).
