Pre-Raphaelite inspiration

In early January six of us headed for Tate Britain and the Pre-Raphaelite exhibition.  I had read half the catalogue (it's huge) but was still not prepared for the size of the exhibition - brilliant value for money.  In fact by the last room I could hardly take it all in.  I would have liked to go again.  
Our inspiration is the PRB and we must choose a painting, take the plants from that painting and do our own interpretation.  Considerations are symbolism, colour, pattern (William Morris for example) and availability of material of course.  We are working in graphite and watercolour.  I have done masses of work so far with almost nothing on the finished piece.  I have bought a new brush too!  As usual I cannot seem to visualise what I want and everyone else's work is far superior.  I particularly admire Elizabeth's work.
My chosen painting is 'Broken Vows' by Philip Hermogenes Cadoran and my plants are ivy, iris and rose, but the rose has now been dropped!