I think it is a draw as to whether you want snow or cream. Try them both. IMHO, if you want to your sashing to remain subtle, the cream would be my choice. For a more dramatic look I would use the red/rust/burgundy that is in your blocks. It can becomes a neutral when used as a frame to show off the blocks. But, I do like your choice of cream as a way to blend back into your blocks. This is the grand part about quilting or crafting or just home decor. Options,that fit your own personal leanings.