I would opt for Chlorophytum comosum ‘ variegatum '.
http://www.plantzafrica.com/pl...
There is another which is similar, a newer cultivar Chlorophytum comosum 'Ocean' ..
http://www.johnjearrard.co.uk/...
The most commonly sold one would be the first, and from other photos I found it doesn't look to have the broad, short leaves which Ocean has.
http://zimmerpflanzen-faq.de/c...
Good suggestion Tara! Dianella has tough leaves as far as I know, I had a plain leaved one which didn't thrive nor survive, the leaves were more like Phormium in texture and generally don't flop like this plant. The plant posted is said to have delicate leaves, Chlorophytum comosum 'Variegatum' shows a lot of variation. They tend to flop more in low light.
Could it be anything else?!