Rectangular, with added interest at corners. Treble cluster stitch.

150 grams of cotton yarn No. 5/white.

Motifs are joined 3 x 6 and edging has picots plus extra bit on each of the 4 corners.

Props: white mat, red roses in brass oval vase.

Pattern 13 in Magic Crochet.
Pattern 13, Tapete para mesila, in Ganchillo Artistico.
Pattern 13, Periwinkle, in Crochet Monthly, #42.

Note that Popcorn mat in Magic Crochet 26 is similar, but with popcorn stitches instead of clusters, and with a different edging.