I have always loved antique botanical drawings. They are so incredibly detailed and beautiful, and I love that they represent the unusual combination of science and art (two of my favourite subjects!). Placing a cluster of these drawings together on one wall is especially effective.
If you too, have a 'soft spot' for this type of art, then head over to the Sudio Botanika website, or buy the book "Mr Marshal's Flower Book' by Royal Collection Publishers. You won't regret it!