I have to admit that I don't like the dying of the bubbles, although I like the general style. What about letting them fall apart instead? And bit green spots between the pieces.

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http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt