Piet Oudolf - master of texture garden grass design

Piet Oudolf is the master of soft textured block planting.  Love the tonal blend through the flower heads and into the grasses - an edited meadowscape.

Our house is very square and very black.  I need the landscape to soften up all the hard lines but still deliver colour, texture and drama.  
I have the main structure, a  backdrop of lilly pilly hedge, a row of gorgeous pear trees for height, seasonal colour and privacy.  I want the beds under the plum trees to be fat with grassy textures, with wild looking flowers adding seasonal colour.

I need to bring the garden close to the house and blur the edges.