Lay the styrofoam boards out on your canvas drop cloth. The adhesive spray is STICKY so don't skip the drop cloth and ideally do this part outside. The spray isn't super smelly but always better to let the fumes escape outside instead of in the house.

Measure the length of your styrofoam panels and cut a length of wallpaper that's about 6 inches longer. You'll want enough overhang on both sides to make folding the paper over the top easy.

Lay the cut sheet of wallpaper over the styrofoam panel and line it up so the design looks straight. Make sure you have about 3 extra inches on the top and bottom.

NOTE: before moving on to Step 2 you may want to use a couple of thumbtacks to secure the wallpaper to the top of the panels. This will prevent the paper from shifting while you're gluing it to the board.

Once you have your wallpaper lined up (and tacked down along the top if needed), loosely roll the paper up from top to bottom.

Grab your spray adhesive and spray a fine mist over the top 3rd of the board.

Carefully unroll the wallpaper and smooth it down over the glued section. The adhesive will take about 30 seconds to get tacky so you'll have a little time to adjust the wallpaper if you need to.

Once the first section is glued down, repeat with the next two sections of the board until all of the wallpaper is glued down.

You should have extra paper on all 4 sides of the board.

Flip the board over and fold the extra paper over the edge. I folded mine the same way I fold the ends of wrapping paper for Christmas presents.

Secure the folded sides with tape (glue would also work but takes extra time to dry).

Place command strips along the top for easy hanging.

All that's left is to hang up your boards!

In my daughter's room I started with 3 boards centered behind the crib and then added 2 more to give it a fuller look.

You could panel the whole wall if you wanted to or just a section like I did.