Monochrome works really well with these images, in this double page layout from Penny, using this weeks sketch. (if your're not getting The Weekly Sketch, click here to request it) Its free!
Monochrome is different shades of the same colour, plus Jenny has the white of the snow too.
Circles also work well if you want to include lots of photos on a page. The ribbon edges help to frame the page, and add some angles which breaks up the circle theme and draws the eye in.
You may want to think about printing your photos in a slightly bigger size if you are cutting into circles or ovals, as you loose a lot of the edge as you trim.