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Incorrect postures and long sitting sessions are among the main causes of back pain and discomfort, a problem affecting a growing portion of office workers. In the past, researchers have suggested possible ways to notify with alerts those users who sit improperly, but often such notifications are perceived as intrusive and tend to be ignored. In this paper, we present a flower-shaped physical avatar that subtly and pleasantly (through motion, colors and sounds) provides an ambient feedback to users about their postures. Compared with similar previous work, the flower-avatar described in this paper presents, through better sensing and fine-grain output capabilities, a more expressive ambient media platform that showcases the potential of media ambient avatars in health-care scenarios.