Transparents Elements in Web Design
Transparent element can give a slight feel in web design. Sometimes all you need is to have a photo in the background without making the text hard to read. Other times you´ve made a great texture as a background and you want that it appears more on your layout. So, using transparents elements for the background of stuff like text, menus and header is a nice way to detach them from the background and, at the same time, making the background appears too. Transparency is a good effect to make sites with a lot of visual elementes looks slighter.
Below you can see some great examples. I hope it can be useful.