Hi garrazzaband,
I have this fresh in my mind because I'll be making a creppy dragon one for my brother soon but how about a terrarium. A little landscaped enclosure.
If you get a yankee candle jar (any size) & put the crystal in the bottom, it can be an ice cap landscape for a mini polar bear sculpture or some sort of sparkly cave ground for a little dragon or fairies. Maybe she'll have a butterfly tattoo by her 18th and you could put a bit of moss in the jar with a few tiny butterflies on wire.
I think aldi have a coffee jar along the line of the yankee candle jars (a bit smaller) at probably 1/4 the price.
Here are a few links to terrariums on Etsy just for an idea of what I'm talking about.
http://www.etsy.com/view_listing.php...ng_id=39321909
http://www.etsy.com/view_listing.php...ng_id=30157063