To work around curved obstructions such as appliances and pipes when laying ceramic tiles, make a template of the desired curve and use a rotary or wet saw to cut it accurately. Wet saws can be rented from many home improvement stores or tool rental centers.
Take a piece of paper and cut it to the size of the ceramic tile you are using. Place the paper up to the area with the obstruction. Make sure to space it in conjunction with the tiles already laid for an accurate template. Trace a line on the paper along the curve of the obstruction, and cut the paper along the line.
Place the paper precisely over the back of a tile so that the rough side is flush against the paper. Draw a curved line on the tile using the template as the guide.
Use a rotary tool or wet saw to cut the tile. Because ceramic is a hard material, a wet saw is a good choice. If you choose to cut the tile with a rotary tool, use a diamond bit. Don safety glasses or goggles to protect your eyes from flying pieces. Hold the cut tile up to the area on the surface with the obstruction to make sure the tile fits.