Tiling odd-shaped rooms is a project that is much easier than it seems. It does, however, require skill with cutting tools, measuring and sizing. You also should know how to use a level. A laser level is an excellent tool when laying tiles in odd-shaped rooms, because you can use it instead of a tape measure to ensure you are tiling in a straight line.
Find the straightest wall in your odd-shaped room. If none of the walls are straight---or if the straight wall is at an odd angle---create a straight line using a laser level or measuring tape.
Draw a line along the level, using chalk or a pencil.
Lay tile along this line as you normally would do along a wall. Continue laying rows of tile away from the first row, until you reach an odd wall. Also, you should lay tile to either side of this initial section.
Look at the tiles you have laid. If there is still space for normally spaced tiles, continue placing the tiles until all that is left are odd spaces---triangles, long rectangles and other non-square shapes.
Lay a piece of paper into the first odd-shaped space that is left. Trace the exact shape of the space on the paper, using pencil. The tracing is the shape of the tile that you will need to cut.
Repeat Step 5 for all odd-shaped spaces that are left.
Tape the paper---shape side up---to a tile, or glue the paper to the bottom of the tile---using a cheap, easy-to-remove glue.
Cut the tile to the shape on the paper---using a tile cutter---and lay the tile as you would any normally-shaped regular tile. Repeat this process for every odd space.
To get the most out of your tiles, lay the flat side of the template against one side of the tile, so you only make necessary cuts. This will leave more of the tile intact, and allow you to cut multiple shapes out of one piece of tile.