Think Geek has an interesting take on the phone charm - a live miniature "pet" cactus in a dome. Complete with a mobile-friendly strap, the Mini Pet Cactus requires very little in the way of horticulture (approx. 1 minute of watering, monthly), and could make a nice companion to the pet bonsai you've got dangling from your key chain.
The Mini Pet Cactus sells for $8.99, with a special stand from which to hang it (if you're not the mobile charm type) available for an extra $1.99.
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