Steve — I don't usually clutter topics with don't knows, but, judging from the multiway adaptor on your window ledge, you're British, so I will say that I've been dealing in British glass now for close on twenty years now and I've never seen one before.
If you will invent new patterns what do you expect?
Start at home with Sowerby, as that flower holder looks like a smaller version of the one on this uranium green set (blue glass doesn't usually contain uranium, Steve ;D ):-
http://glassgallery.yobunny.org.uk/displayimage.php?pos=-12851http://glassgallery.yobunny.org.uk/displayimage.php?pos=-12852
Bernard C. 8)