Made using one cone of tshirt yarn (or make your own, of course) and a large hook, these slippers are a super-quick and easy make.

This PDF contains all the instructions you’ll need to make a pair of adult slippers.
Instructions are given to make the following approximate sizes:

Small: UK size 2-3/ EUR size 35-36 / US size 4-5
Medium: UK size 4-5/ EUR size 37-38 / US size 6-7
Large: UK size 6-7/ EUR size 39-40 /US size 8-9
Extra Large: UK size 8-9/ EUR size 41-42 /US size 10-11

This pattern is easy to vary to make smaller or even larger slippers, too.

To make the small and medium slippers, you will need a 12mm hook.
To make the large and extra-large slippers, you will need a 15mm hook.

You can try using several strands of dk from your stash to make a pair too!