Tie the brick using the twine. For the twine at the top that will support the weight, combine several strands for added strength.
Create a sleeve for the brick by gluing or sewing two pieces of felt together.
Slide your brick into the felt sleeve. I added some paper on the bottom to avoid snags. Once the brick was down towards the bottom of the sleeve, I removed the paper.
Close the bottom end of the felt sleeve with hot glue, trimming as necessary. Let cool and hot glue rug pad to the bottom.
At the top end, make two holes and run the twine through for a hanger. Trim the excess felt then hot glue the top in the shape of a milk carton.
Knot all the ends of the twine to make the loop, including those supporting the brick.
Add mini tassels to the front if you like.
Video
Notes
The reason for the twine is both to hang and to help support the brick at the top - if just the felt is supporting the brick, it will eventually rip.