While I have a great number of vases I still find simple unique collections of bottles, be they old or new, really charming for display flowers.
Just lately I have collected a few. Some I found at a bric a brac shop that were old nectar bottles (very small and rather milk bottle like), some I have just cleaned and de-labelled from our cupboards that were former balsamic vinegar or olive oil bottles and I have 3 turquoise ones that were a dollar each from an op shop - they look so pretty with pale pink roses in!
Some of the antique/vintage shops here in Sydney will charge an absolute premium for the washed up beachy vintage bottles that are so coverted. Tips I have picked up apart from shopping around at markets, car boot sales etc. include looking out next time you're grocery shopping for yummy condiments that come in charming bottles and (typically European) liquor or olive oil bottles. If you really want the old look then you can age them with a metal scourer and soap to create a residue (sounds lovely doesn't it!).
Love these images above - all great ideas for styling my Easter table. :-)