We bought some tiles and then got home and started looking at design which suits the background along with our countertop. We then settled on one of the tile sheet. (if you are lazy then select tile sheets, less work to do with them). We selected mosaic tile sheet with another stone type tile to go with it in between (for 3 lines).
We then started out our project by clearing out the area we want to add back splash. Before you start on anything add scotch blue tape in the area outside you want to add. for example, if you are adding it above granite countertop piece, then add blue tape on the edge and start of the wall and granite countertop piece. Then you select the thinset that goes with it. We used the adhesive instead of thinset. Adhesive goes well with glass tile or mosaic tile. Layout the structure you want on a plain surface. Cut the design in the way you want it.
Note: Consider the electrical outlets or any other hindrace in between (while laying out the design). Cut the design accordingly by considering all the above.
By using 3/16" trowel, we then spread out the adhesive on the wall. After the adhesive is spread out (for around 2 feet) we then use the angled side to make it even.
Note: while applying thinset/adhesive you should apply it by keeping trowel at an angle. if you apply it straight it wont stick fine. You will know this, by experience.
Now all you do is attach the tile onto the wall starting from down to top. press the whole tile/tile layout once.
Next step to do is grouting after 24 hours.