You can get a giant 8ft by 5 ft St George Flag here for £15.99
[url=http://www.flagandbuntingstore.co.uk/acatalog/England_Flag.html#aFLSGEngland[/url
Just needs Blue stripes sewing in a couple of the white squares, and FAX etc writing/painting in the other corners.
Alternatively, I'm sure you could do something with a Greece Flag
[url=http://www.flagandbuntingstore.co.uk/cgi-bin/sh000003.pl?REFPAGE=http%3a%2f%2fwww%2eflagandbuntingstore%2eco%2euk%2fcgi%2dbin%2fsh000003%2epl%3fREFPAGE%3dhttp%253a%252f%252fwww%252eflagandbuntingstore%252eco%252euk%252facatalog%252fEngland_Flag%252ehtml%26WD%3dscotland%26PN%3dScotland_Flag%252ehtml%2523aFLSA&WD=greece&PN=Greece_Flag%2ehtml%23aFLGR#aFLGRGreece[/url