Again I have chosen a genre rather than a particular illustrator. I have always loved books with simple two-colour illustrations.
Often the illustrators were not credited, but you can find heaps of books published from the 1930s to the early 1960s with these beautiful drawings. Often they are annuals, with lots of short stories and puzzles, sometimes they are ABC books or colouring books.
I love the simple use of colour - red, yellow, green, teal blue, always with black, and the joyous simplicity of the images. The themes I love too - domesticity, boys and girls, pixies and fairies, nature, mysteries, special days out. I remember adoring these books as a child, they seemed very nostalgic even then so perhaps this is where my obsession with vintage childhood first started!
I also love that these books are very British. Full of squirrels, rainy days, tea shops, woodland magic and policemen on bicycles. The publishers are usually Dean's or The Children's Press, and this type of illustration also appears in lots of Enid Blyton books. I find them so inspiring!