The new postbit homepage now has full image as the background.
The background picture is a Tuscany road in Italy, in the way between Florence and San Gimignano (a small medieval hill town in the province of Siena, about 54km from Florence).
Visit this featured photo album created with Postbit, where the original picture can be found: Tuscany road - Italy
The background is created with the CSS command "background-size: cover". When user resizes the browser, the background image also is resized automatically according with browser size. The css command should be compatible with all browsers, so use this syntax to create a body background with full hires resizable image:
<body style=" background-color: #303030; background-size: cover; -o-background-size: cover; -moz-background-size: cover; -webkit-background-size: cover; background-image:url(http://example.com/your-full-screen-background-picture.jpg); background-repeat: no-repeat; " >