You will need...
2 identical bears
thick fabric (for the bottom, just enough for your two feet outlines)
red and brown felt (My bears came with a red, and I just colored it for brown)
needle and thread
a sewing machine (this could just be your very own hands!)
a hot glue gun
Step 1: Rip 'em to Shreds!
Step 2: Facial Reconstruction...
You will want to cut two ovals out of your red felt for the mouth. Where the nose once was, you now have a bulge. Sew the center of the oval (long way horizontal to the face) into the center of the bulge. This will make for a toothed, bloody red, just-ate-your-tauntaun look.
Now, if you have a glue gun, it is handy to glue little folds (two top, two below) for teeth. If you don't have one, I would suggest sewing the little folds. Once those are in place, push the oval and the bear-face-bulge in to make a mouth. Sew mouth in place.
Horns can be cut from brown felt, or red and colored brown. Make 4 identical cornucopia shapes and stitch into place.
You will want to take out the ears, and take the back of the nose, and stitch it up between the eyes.
Step 3: Start Making Slipper... Pieces
Shape face as needed. You want a rounded bottom and a strait top (semi circle). Sew the strait edge with the backing you've made
Step 4: Assembly
Take bottom piece and, beginning from middle of side, stitch around slipper, leaving about 4 inches open for flipping/stuffing.
TURN 'ER ABOUT! How exciting!! You are now ready to stuff! Split up half of all stuffing/scrap remaining (**Hint: if you have a bit of excess 'fur', you can cut it into smaller pieces and use it as stuffing). You really want to fill these pretty packed, because the act of walking on them will smush the stuffing over time.
Once stuffed, stitch the side shut, and do the other slipper, and ENJOY!!