I agree with Dunster... that would work. See how large a 45 degree diamond you can get on freezer paper... then measure point to point, that would be the size diamond you are starting with. Then the two more narrow white logs, then the two *brightly-colored* wider logs... see how many inches longer that makes the point of the *diamond*...
If its a queen sized mattress, thats 60 inches wide.. so you only need to work towards a diamond that is 25 or so inches point to point, including the logs.... and some background at the points, if you need it... seems like you could get up near that size with freezer paper that is 18 inches wide for the initial diamond...