As you can see in the picture, it is not exactly square. I have miscalculated the gauge first and noticed halfway into the pattern. If you add 5 stitches on either side, it will turn out in a nice 35x35cm square.

I have used these colors:
0253 Jade
0106 White
0110 Black
0113 Violet
0209 Mandarin
0146 Turquoise
0208 Canary
0245 Anise

but you can of course choose any colors you prefer.

For the back of the pillow you can do a solid color tunesian crochet or make a second owl :)

Pattern includes chart