Although one may think that non-square motifs aren't great flower afghan block ideas, that's certainly not true. To this point, here is a flower-themed hexagon that can make an afghan in a honeycomb fashion. Moreover, it gives any blanket a lovely, 3D texture that will be a hit.

The full tutorial about this pattern you will find on vcrochetpatterns.com:
Hexagon Pattern with 3D Flower
Sand Dollar Afghan Block
"This simple afghan block uses just a few simple stitches and some back post only rows to create an embossed sand dollar in the center of the square. This gorgeous beachy themed block is perfect for making a blanket on its own, or gorgeous paired with other simpler textures. The afghan block pattern here is a traditional 12" square, so it's easy to pair it with other styles of crochet afghan blocks for the perfect beach themed blanket for your home."

Crochet Bobble Drops Flower Hexagon
Do you like hexagons? This beautiful hexagon pattern is great for making blanket, pillows, bags and more. You can use them to create a lot of stunning patterns by joining together. I made this hexagon in two ways. I found that this hexagons have different look when making them in solid and two-tone. To make these hexagons I used special stitch called front post bobble stitch (fpbobble). This stitch adds 3D effect and beautiful texture to the hexagon pattern.

New Beginnings Afghan Block | Secret Garden Add-on
"This beautiful 12" afghan block has a simple center edged with a flower petal design. Use it as a contrast square to tone down a highly textured blanket, or by itself to create an afghan that is beautiful and unique. You will need to know how to crochet post stitches, cross stitches, and shells. This block looks its best and most elegant in a solid color, but feel free to change it up and make it your own! "

Sugar Sand Afghan Block
"This easy crochet afghan block uses a simple crochet texture stitch to create the effect of little seashells nestled in the sugar sand of my favorite beach. Perfect for adding just a bit of texture to an afghan! You can use this block on its own, or combine it with other blocks for a fun quilted look. You'll need less than a skein of worsted weight yarn for this pattern. It creates a beautifully textured 12" crochet afghan block, perfect for making crocheted afghans of any size, and in any color."

Wind Flower Hexagon
Lastly, this summer flower hexagon blanket sports stunning raised flower appliques on a traditional hex. Thus this is actually a bit of a conceptual hybrid between the previous two patterns.