I can't say I regularly tote around miniSD cards, but if this fun holder could carry a USB stick, I'd be all for it. These card eating straps which I saw on OhGizmo! can be attached to cell phones and cameras so you know exactly where your memory card is at all times. Maybe not as bling as the Louis Vuitton charm but much more practical and user-friendly than the cell phone cuffs! Priced at $10.
MicroSD Card Cell Phone/Camera Strap