I like to work with different mediums and switch between pencil drawing, water colour and digital drawing. There is nothing quite like the feeling of your pencil tip moving across the surface of good quality paper and it is still very exciting (and terrifying!) to start a new sketch that way.
For fabric designs I often draw digitally as it helps me get the crisp finish I need to create different colour ways of each design. Playing with different techniques frees up the mind and helps me to look at designs in ways.