Here
Thanks, Stonecold.
Well, it's clearly not the Italian flag as the bars are not horizontal.
The only flags I can find like that are the previously mentioned North Rhine-Westphalia, the pre-1980 flag of Iran and the pre-1900 flag of Quebec.
The flag of Iran does have a symbol in the centre though, and the pictured flag is just a plain tricolour.
To me, it does look like it's the North Rhine-Westphalia flag.
I go to Sardinia in a few weeks and I might try to pick up a large Italian flag to paint a Liver bird on.