Some interesting and different pieces there. #1 is like a Murano geode bowl but with a foot applied, which makes me wonder. Could it be Czech? Bowl #2 is intriguing in that I haven't seen a Murano company do this stretched, quasi-ariel bubble effect before. It's usually associated with Orrefors, Leerdam, or Nuutaj√§rvi, but not in these colours. #3 looks the most Murano-like to me, possibly Barbini. Does #4 have some opalescence in it? It also could be Czech, although I'd lean towards Murano.
I'm being very tentative here, especially since Ivo says that they all look like Barbini to him. I'm replying more to get a discussion going than to suggest with any certainty. I'm interested to hear what others might say. It would be much easier if you split them up, though.