Check out Mountain Peek Creations website for lots of patterns that use a focus fabric as a large blocks with other blocks around it.
http://www.justitdist.com/mountainpeek.php
You will need to scroll about half way down the page to start seeing patterns that would work for this - - i.e. Spot Light, Sidelight, Center Stage, Grand Stand, Arcadia, Times 3 are some that might work for you.
These would be simple quilts to do and would showcase your central fabric.
I would not use the iris fabric as a border fabric because the "blocks" on it are staggered so, to me anyway, the border would look "catty-wampus". I would use the iris fabric as my central/focus fabric in a large block or blocks.