Rather Big and Bold Vase - Country of Origin??

Found this very large and beautiful vase today. Beautiful deep blue colours with marbling through it. Base is flat and no marks but a fabulous looking thing and very well made and heavy. It's big, about 50cm high.

I know nothing about glass really so I was hoping someone here might be able to give me a possible country (or even maker, but that's probably wishing for too much). Anything you can tell me would be really great. And sorry there is only the one picture, just snapped a shot with my phone.

Thanks all.