Place felt ball is a way of knitting with felt balls to embellish your knitting. First you pre-string your felt bobbles. Then place them in your knitting, and knit around them.
Sometimes this embellishment is written into a pattern using the phrase place felt ball. Sometimes it is written into a pattern as k1-bubble.
How to place felt ball
Pull up one felt ball until it is as close to previous stitch as possible, then use yarn immediately after felt ball to knit stitches.
Other embellishments include, beaded corners, or i-cords.