Majestic Bloom Granny Square - free crochet pattern and tutorial from My Hobby Is Crochet! I love the big bold of this flower. And the easy surrounding repeats mean you can customize the square to whatever size you need!
Hexagon crochet motifs are popular, but have you tried Octagon motifs? The Oceanic Octagon Motif is a pretty and pleasing crochet motif to try. The center is a crocheted circle which then branches out into the eight sides creating the octagon.