I had originally planned to use light grey scrapbook paper throughout the kitchen and dining areas - Glass Slipper by Bazzill Basics - but I ran into two problems.  First, with the white brick on one wall and light grey wallpaper on the rest, the room lacked visual impact.  Second, and more importantly, I had cut the pieces to run between the white painted connectors and it just didn't look right with the white vertical breaks in color.  I didn't have any more of the Glass Slipper paper, and we're effectively snowed in here at the moment, so I used a darker grey that I had on hand - Tiara by Bazzill Basics.  It has the same texture and sheen as the lighter paper, so it blends well.

I used a simple technique for measuring and cutting the paper to follow the wall contours to cover the connectors.  I started by measuring the wall height and cut the paper off along the top.  Using one factory straight edge as my starting edge, I scored the paper (either on the front or back depending on the direction of the fold) to follow the first angle.  I folded the scored paper over the edge of my cutting board to get a crisp line.  I placed the paper back in place to check for accuracy and then marked the next fold.  Using a ruler isn't as effective as just holding the paper in place and marking where the next fold should be since the walls are not usually straight.  Once I had all my folds in place, I held it in place to mark and cut the window opening.

Here is one bay piece scored and folded, ready to be pasted in place.

I left a little extra on the trailing end that would be covered by the adjacent piece to help hide any gaps between the two pieces.  Below the two side pieces are glued in place using Yes! paste, and the middle flat piece will overlap their edges.

As you can see, no white shows along the sides of the middle bay piece.

On the long wall, I placed the seam where the range hood and backsplash will be so the break in the paper won't be visible.  The doorway to the living room will be framed with trim so those gaps will also be hidden.