Check out these oh-so-Flintstone's rock pillows available through the UK's FOS Highwater. The hand painted cushions are available in three colors and four sizes. I'm sure they're softer than they appear.
Sofa Garden peddles pillows. Although known for their novelty-shaped pillows, which includes pears, wine bottles, and sea shells to name just a few, they also carry lovely traditionally-shaped cushions. But since so many pads put up with prosaic pillows, why not go for something daring for the den? A couple of chubby cigars, perhaps.