A shade of green such as Benjamin Moore Providence Olive would be pretty with your tiles. Or a rich tan that matches one of the rocks from your accent tiles. Of the samples that are already on your wall, the two light tan colors that match the tile would work (one on the right and one on the left). They are very similar to the tile though so you would want to bring out accents of dark brown or tan in your towels and accessories. Something similar to the clayish tan color right underneath the window on the left wall could work, but not that particular shade. The right shade of cream would be pretty also (but not the whitish color on the right of the wall). Definite no on the purple and gray samples.