Try this link.
http://www.grassonthedash.com/

I found some wonderful little plastic watering-can shaped window-sticking plant rooters at The Good Will. I have 4 over my sink. They hold about 4 oz. Wish I knew where to get more, I'd tell ya.

They would sure be simple to make with miniature glass vases (Wal-Mart, Michaels, etc.), small suction cups (they come in bags of 1/2 dozen or more), and a little bit of copper or aluminum wire (craft department).

BUT, here's what you want, ready made.

Here is a link that might be useful: glass rooters