The great part about this technique is that you can fabricate the panels in your garage or shop so that you don't totally besot your house with mess.
Step 1: Site Prep
Originally our hood pipe was hidden in a soffit. I removed this soffit and covered the hood with a removable three sided box and painted it the same color as the wall. The part against the ceiling and wall was finished with a white painted cove moulding.
Step 2: Gather Materials
Don't ever be mundane. You could get really nuts and use a welded wire mesh to make curved and humped designs for a chandelier or decorative wall hanging. Glue the tile to the mesh with adhesive and then once, dry apply a mortar or grout to the back to really grab and hold the tile.
I used 1x1 tumbled slate.
My backing is 1/4" plywood subflooring.
The adhesive I used was a water resistant construction adhesive. When in doubt use water resistant. You can also use thinset mortar on drywall and wood, but I usually stick to construction adhesive for these and leave thinset for concrete and concrete board.
You'll need something to spread the glue/thinset around. Here I used a small notched trowel.
Step 3: Dry Fitting and Gluing
Once you have everything fit the way you like it, spread your glue and adhere your tiles to the backing panel.
Step 4: Grouting
Step 5: Mounting
You can drill your holes in areas that can be covered with wood or pvc mouldings. I didn't bother. The two holes on the bottom of the panels are out of view and the two at the top are exposed, but unnoticeable. You could us grout or color matched grout caulk to fill the holes over the screws. You could even drill your holes between the tiles in the grout lines and then cover them with grout.
Step 6: Another Example
These panels are mounted on 1/4" cement board, the Hardibacker variety. I made them in the garage---attached the tiles, grouted, and applied a gloss finish---and the only mess that was made in my laundry room was drilling the holes (I had to do it in the room to make sure I hit studs) and applying the grout caulk along the bottom and in the corner. There are six screws holding up the larger panel and four holding the smaller. You might be able to find them if you look closely, but I never see them because they blended in so well. The large panel was maybe 30 or 40 pounds. It was quite easy to install.
Go forth and make.