I wish I would have found this Diy before buying my fuzzy rug!
I even made one for my sister to put in her dorm room and it looks so amazing!
Use duck tape to do this.

You might want to do multiple layers of tape to reinforce the hold.
Zestie Estie via YouTube video.
Step Two
Attach the first blanket to the mats.

Cut off part of the sides, so the center of the rug lays higher than the top blanket.
Attach the first rug with a spray fabric adhesive and fabric glue.
Step Three
Attach the second blanket to the rug using fabric glue.

Allow the glue to dry for an hour before flipping it over for step four.
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Step Four
Flip the rug over and using duck tape.
attach the edges of your blanket to the back of the mats.
Reinforce the corners and edges on the underneath of the rug with duck tape.
Step Five
Attach non-slip carpet tape to the bottom of the rug.
This will keep the rug from sliding around on your floor.