I thought making my own knitting needle case would be easy, easy, easy. The project as a whole wasn't difficult; but stitching so many parallel lines accurately was. Before I began, I envisioned myself making a bunch. Not anymore. There are lots of instructions on the internet; below are some of my favorite.
cardboardboyfriend - felt
Craftster - needle case made with a vintage physics book.
Splityarn - circular needle case
Purl Bee - nice! circular needle organizer
I do enjoy making stitch markers. Unfortunately, I only need a few nice ones. I've tried making them several different ways & have settled on using soldered sterling jump rings (10mm or 8mm) & 22 gauge 2-2.5" headpins. The soldered jump rings cannot snag on anything, & the extra little bit they cost is worth it,because they can be polished & will last & look good. The 22 gauge headpin is strong enough that it doesn't bend easily, but lightweight. These stitch markers slip easily from one needle to the other & don't get caught on the knitting. Row markers can easily be made using a sterling silver clasp in a medium to large size.
How to make a wire-wrapped loop
*I even resized this video