When you get to the end, tie the other end of your yarn in a knot to secure it to the stick. (happyhourprojects.com)
Weaving in ends is essential for knitting projects because it hides those loose ends of yarn and keeps everything nice and finished so you can use the finished project. (thespruce.com)
If you're good with needlework, try crochet garlands using the basic granny square pattern, or knit some multi-coloured flags with odd ends of yarn. (idealhome.co.uk)