I finished up the quilting and spent 5 minutes trimming my loose thread ends. I left some loose threads on the back because it will be inside the pillow, which is a little bit unfortunate because I love how the back looks. This would really be a beautiful quilt (But heavy! Even this 18×18 pillow front is quite substantial.)
Then I trimmed off the extra fabric.
I debated about adding a border around the quilted section to make the pillow a little bit larger. In the end, I decided to skip it, mostly because it was another step. I chose a khaki twill I had on hand for the backing and sewed in a 12-inch zipper.
Whenever I make a pillow, after the backing and front are complete, I run both through the serger. I like my pillows to have tidy edges with no fraying inside of the pillow and serged edges make it easy to sew it all together in the end.
Then all I did was sew it all together! Tada!