I have never made a OBW but it is on my bucket list. I Googled One Block Wonder 2 fabrics.
Almost all were definitely only one fabric, but this one looks to be two.
https://i.pinimg.com/736x/b1/08/a3/b...k-quilting.jpg
This one has several different fabrics in it and more.
https://www.susangarrityartquilts.co...d%20fabric.png
This may be only one fabric, but is a good example as to how you could merge two.
http://2.bp.blogspot.com/-lT9cXxIgKy...9+18.25.45.jpg
Another beautiful example of contrasting colors...probably one fabric, but could be more.
https://www.pinterest.com/pin/433190057881092377/
Love this circular one.
https://www.pinterest.com/pin/517280707181001578/