Yesterday I attended a willow weaving course at Winterbourne, an Edwardian house museum in Birmingham. The course was led by Jonathan Ridgeon whose website features an article with instructions to make a basket very similar to the one I made, which is pictured here.
To achieve the two-tone effect we used a combination of willow without bark (the paler colour you can see on the base and edges of my basket) and with bark (the green colour used on the sides and handle of the basket).
I’d like another go as it took me a little while to get the hang of weaving so the base of the basket is a bit wonky, but It didn’t turn out too bad for a first attempt.