I like these block designs as applique, especially if it becomes trapunto style, and as quilting motifs. As the latter they make a nice change from feathers!
I would do the background filler in thread matching the background, and do a on point grid.
Only one border, and the whole quilt has only a few applique blocks, and the other blocks are quilted. I think i would applique the whole of the outer row of blocks leaving just four blocks to be just quilted.
Only parts of one border are applique, the rest of the two borders are quilted only. With all the designs in this project file the quilt only areas could be appliqued, but I like to see some areas of any quilt with quilting designs which are based on both pieced and applique designs filling some of the blank spaces.
I like to leave space around applique blocks. This design has just eight applique blocks which leaves room for quilting to be showcased. I would perhaps use a more subdued thread colour in a real quilt, and the blank spaces in each block I would fill with a filler such as cross hatching.