I began making my own pillow boxes for jewelry items that won't fit in my small jewelry kraft boxes... like shawl pins, purse hangers, hairpins or larger vintage pieces. I use textured pastel card stock, put my shop label on and tie them lengthwise with an organza ribbon, and ship them inside a bubble mailer.
They've been very well received by my buyers, who have even remarked about my cute packaging, and add almost nothing to my packaging costs.
So, hang onto them... I'm sure you'll find the perfect use for them ;)