About the Quilt:
If you notice, great depth is created with all the really dark fabrics in the quilt. You need to include them to give depth and scatter them throughout. It's ok if you have a dark print meeting a med. or another dark print provided they are in different color families and there is a definite distinction. Otherwise, 2 darks together can distract from the theme or focal point, and, in this case, the Greek Key that we want to stand out! I did notice later that I had inadvertently used a really pale fabric near the stem of the Greek Key on 2 different blocks. Fortunately, it did not distort the image so I left it in, but we want to avoid using a really pale white background print near the stem of the 'G'. I took a pic of that block for you to see. If this happens and the quilt is finished, you could always just applique another print over top of that pale block to correct that area. The pale block could change the letter 'G' into looking like a number 6 or another letter altogether when viewed from a distance.
Squaring up of blocks:
I skipped this part although you may want to do like I did and just shave off minor bits to even the block up without squaring it up. Since the blocks finish @ 1.5", squaring up should be minimized unless necessary.
Pressing of blocks/pinning:
I don't press my sections after each addition of adding a piece like most quilters, but you may want to do this. I also do no pinning as I taught myself to sew without it in order to save time and it works for me. I do a final pressing of the block before joining.
Joining of blocks:
The blocks join just like you would a pinwheel with the top left block aiming upward, top right block to the right, bottom right aiming downward and the bottom left block shooting to the left if you desire to join them this way. However, the lay-out of the blocks is more interesting to me than the block itself. Have fun with your lay-outs. It would be a nice quilt in a larger size block too~!