One Simple Motif - Many Possibilities!

Knit a square using the method described in this previous blog post except when you get to the halfway point, change yarn colour.

Make a load more just the same and depending on how you arrange them, you have a lot of options for creating a patchwork effect blanket. I started off playing with four squares.

 Then I used some imaging editing software to generate the mock ups below which give a good feeling of how the blanket could look overall.