This project was designed entirely by my seven-year-old. So if it's not Minecraft-correct, blame him.
If you really want to pixelate your greens, just make the indicated sizes with 2" squares. For example, A can be made with 20 2" squares (2x10 layout), B can be made with four (2x2 layout), etc.
A - (2) 15.5x3.5"
B - (3) 3.5x3.5"
C - (2) 6.5x2"
D - (2) 5x5"
E - (1) 2x3.5"
F - (2) 3.5x3.5"
G - (1) 2x3.5"
H - (1) 6.5x3.5"
I - (2) 2x2"
Assembly the center pieces - (E+I)+H - in Row 4 first. Press to the black.
Assemble Rows 2, 3, and 4, continuing to press seams to the black.
Back with muslin and quilt as desired - per my expert's advice, I used a dark green thread and echo quilted.
Use one of the following methods to make it into a pillow cover:
Envelope-style - what I used. Note: if stuffing a 16" pillow into a 15" cover, give plenty of overlap in the back.
And that's how you get a seven year old boy to yell, "I LOVE YOU!"