Hi John,
I use Macconkey Jars for displaying small flowers...They might also be called Universal Jars. The jars are straight sided, so they can be tied together easily. They have a capacity of about 20ml. The jars are standard kit for Microbiologists.
The photo shows a group of seven, and a group of three that had some spring flowers in them a fortnight ago!
I've also found a couple of photos of them in use with snowdrops... but these pictures don't focus on the vases!
Tim DH