Pattern available here: http://milk-shed.com/2014/12/09/basic-ball-christmas-ornament-free-pattern/

Supplies:

scrap Bernat Roving or similar bulky yarn

5.5 mm (size 9) DPN or circular needle

Poly-fil stuffing

Stitch marker

Needle for weaving ends

Gauge:  Unimportant!

Notes:  I started my first test ornament on DPNs but find them too fiddly to work with these days.  I much prefer using interchangeable needles with a long, very flexible cable.  Of course, do whichever you prefer.