I'm a bit suprised that you find Blue Label similar to Aqua di Gio. There are many aquatics that you could try, some are more similar to AdG than others. However, as far as greener scents go, there are some great ones out there as well. I mentioned 212 by Carolina Herrera earlier. I would defininetly recommend you give that one a try if possible. Yesterday, I received a bottle of Tom Ford Grey Vetiver in the mail. It was a tester that I got off ebay for 58 dollars. I was watching a couple of Youtube videos on spring scents, and both guys had it on their list. It's basically described as a vetiver scent for people that don't normally like vetiver. Tom Ford Samples are probably more difficult to get than Givenchy, so you may have to either chance a blind buy, or skip it altogether. The other green scent I mentioned before was Mugler. It has a soapy vibe to it. Some say it reminds them of Irish Spring. Samples of it are available, and I would recommend giving it a shot.
I still believe that there are aquatics out there that you could try that are unique enough that shouldn't get you lost in the AdG shuffle. Other great ones besides Blue Label: Nautica Oceans, Zegna Z, and Hummer H2. But if you decide to explore the greens, definitely consider 212, Mugler, and Grey Vetiver.