Here's what you will need:
From GREEN fabric:
Cut 3 - 1.5 x 3.5 inch strips
Cut 1 - .75 x 3.5 inch strip
Cut 3 - 2 inch squares
Cut 1 - 1.5 inch square
From ORANGE fabric:Cut 1 - 1.5 x 3.5 inch strip
From WHITE fabric:
Cut 2 - 1.5 x 3.5 inch strips
Cut 3 - 1 inch squares
Cut 1 - 2.5 inch square
Cut 2 - 1.5 inch squares
From BLACK fabric:
Cut 2 - 7/8 inch x 3.5 strips
Cut 2 - 1.5 x 10.5 inch strips
Cut 2 - 1.5 x 5.5 inch strips
Cut 1 - 13.5 x 6.5 rectangle
Cut 1 - 13.5 x 6.5 piece
Cut 1 - 2.25 x WOF (width of fabric) strip; press in half lengthwise.
Irish Flag Block: Sew together one each of the green, white, and orange 1.5 x 3.5 strips (1/4 inch seams throughout).
Shamrock Block: Put one 1-inch white square into the corner of each of the three 2-inch green squares. Mark a diagonal line from corner to corner; stitch along line. Trim and press outward.
Make stem of shamrock by cutting white 2.5 inch square on diagonal. Sew white triangles to either side of .75 x 3.5 inch green strip. Press and trim to 2 inches square.
Sew together the four squares to make shamrock. Press and trim block to 3.5 square.
Nine-Patch Block: Sew together two 1.5 x 3.5 inch green strips with one 1.5 x 3.5 inch white strip in center. Sew the two white 1.5 inch squares together with one green 1.5 inch square in center. Sub-cut the green-white-green strata into two 1.5 x 3.5 inch strips. Assemble 9-patch.
Sew a 7/8 x 3.5 inch strip between blocks.
Sew black border strips to top and bottom, then to each side.
Layer backing (wrong side up), batting, and top. Pin baste. I like to use straight pins for small projects like this, as they're easier to remove without shifting layers.
Quilt as desired. I went with straight line, vertical stitching in the ditch. You will want to switch to your walking foot at this point if you're doing straight line quilting. I also find it helpful to use painter's tape as a guide.
After quilting, trim away excess batting and backing. Press binding strip in half lengthwise and bind.
And you're done! Admire your mug rug from both sides!
Then pour yourself a cold one (or hot), and celebrate!
Oh, how I wish this were Bailey's Irish Cream, but being dairy intolerant, I had to settle for chocolate soy milk (and dream on). Anyway, cheers!