We recently purchased a larger area rug for our living room. I love that it fills up more of the space and defines the sitting area, but most of our furniture now sits half-on/half-off the rug. Since the rug is over 1" thick it created a real issue ( think of red wine on an unbalanced end table!)
After failed attempts to re-arrange the furniture, I turned to these felt furniture pads to extend legs that fell outside of the rug. I had purchased a huge package of them at Costco when we changed to dark floors to avoid scratches.
I love using the felt pads because you can keep stacking them to get the height needed. In my case, every foot outside the rug needed two pads.
Since our floors and dark and the pads were light, I colored them with black permanent marker so they wouldn't show.