This is the pattern for a child and in half double crochet, you can make it in any size and in any stitch. Overall beanie shape pattern is from Elizabeth Roggasch.

Child Size Beanie
Ch 4 & join w/ sl st to make circle (OR make a magic loop)
Rnd 1: ch 1, 9 hdc in ring, join with sl st {9 hdc}
Rnd 2: ch 1, (2hdc in each hdc), join with sl st {18 hdc}
Rnd 3: ch 1, (hdc in next hdc, 2hdc in next hdc), join with sl st {27 hdc}
Rnd 4: ch 1, (hdc in next 2 hdc, 2hdc in next hdc), join with sl st {36 hdc}
Rnd 5: ch 1, (hdc in next 3 hdc, 2hdc in next hdc), join with sl st {45 hdc}
Rnd 6: ch 1, (hdc in next 4 hdc, 2hdc in next hdc), join with sl st {54 hdc}
Rnd 7: ch 1, (hdc in next 8 hdc, 2hdc in next hdc), join with sl st {60 hdc}
Rnd 8-19: ch 1, hdc in each hdc, join with sl st {60 hdc}
Fasten off, weave in ends

~Note: this half is how I embellished it~

Ears
ch 10
work 8 hdc
Crochet a square and fold in half
and sew close along the edges to finish off and attach to beanie

Eyes
ch
3hdc in 2 from hook
work hdc across
2hdc in last
work hdc across opposite end

Nose
work same pattern as eyes

Box
ch as long as you want
make rectangle with hdc
wrap with yarn to close in the center

And embellish as you wish, add stitching , a heart,skull, blood stops, brains, scars,etc...be creative and have fun with it.