I did much better than I thought I would today! The hummer storm is now 4x4! Huzzah!
Now I have to work out if I have enough of the turquoise left to make it 5x5...sadly the turquoise is out of stock everywhere, and I've run out of places to try now :-( I've found the same design in a greeny/teal colour, so will use that around the edge of the turquoise, keeping the dark blue the same. I'm hoping this will look ok, because I would hate to ruin this one now, when it's looking so pretty! If anyone has any better ideas, I'm all ears :-)