I first used a short section of gutted green paracord to work over a keyring. Then I used white 0.9mm braided nylon cord to make the dreamcatcher knot work over the keyring . And finally taking a length of 550 cord through the Spyderco knife's lanyard hole, looping the ends around the dreamcatcher fob and doing a section of snake knots to finish.
Added a few more photos. There are plenty of online instructions for dreamcatcher tying methods if you google them. You can vary the look by how many hitches you initially make around the ring and how tight/loose you you do them as you go and what cord you use.
I do the dreamcatcher before adding the paracord for the lanyard/fob, so the photo showing the cord looped around the ring is just how/where on the keyring it goes and it'll cover the starting knot of the hitching.