You should mix and match fabrics to keep the look contemporary. This style will work just as well in a modern apartment or a country cottage.
Window treatments could either be roman blinds or full length curtains. Look for fabrics of botanical prints or animals that could have come straight from an artists' notebook. Pale wood shutters would also work well in this theme.
For upholstery cover a favourite arm chair in a plaid fabric. Sofas should be squashy and comfortable and covered in plain linen.
Mix and match cushions using patterned and plain fabrics to create a relaxed feel.