Bubble.qml Example File

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 import Qt 4.7

 Rectangle {
     property bool rising: false
     property bool verticalRise: true
     property real xAttractor: 0
     property real yAttractor: 0

     width: 5 + 10*Math.random()
     height: width
     radius: Math.floor(width/2)-1
     property real amountOfGray: Math.random()
     color: Qt.rgba(amountOfGray,amountOfGray,amountOfGray,1)

     y: (rising && verticalRise) ? yAttractor : Math.random()*(main.inPortrait ? main.baseHeight : main.baseWidth)
     x: (rising && !verticalRise) ? xAttractor : Math.random()*(main.inPortrait ? main.baseWidth : main.baseHeight)
     Behavior on x {
         id: xBehavior
         SmoothedAnimation {
             velocity: 100+Math.random()*100
         }
     }
     Behavior on y {
         id: yBehavior
         SmoothedAnimation {
             velocity: 100+Math.random()*100
         }
     }
     Timer {
        interval: 80+Math.random()*40
         repeat: true
         running: true
         onTriggered: {
             if (rising) {
                 if (x > main.width || x < 0) {
                     xBehavior.enabled = false;
                     rising = false;
                     xBehavior.enabled = true;
                     rising = true;
                 }
                 if (y > main.height || y < 0) {
                     yBehavior.enabled = false;
                     rising = false;
                     yBehavior.enabled = true;
                     rising = true;
                 }
             }
         }
     }
 }