I got the pattern for the monster from Usbourne How to Knit. Here it is (forgive me for no proper abbreviations - it's a kids book and I'm just learning ;-) ).
1 x 50g ball of aran wool (doesn't use much though)
For the body (make 2)
Cast on 20 stitches.
Stocking stitch (knit a row, pearl a row) until the knitting measures 7.5cm.
Next row, K2, slip the first stitch over the second one then K to last 2 stitches, K2 together.
Next row, P to end.
Repeat last two rows until you have 12 stitches left.
Next row, P to end, then cast off.
For the arms (make 2)
cast on 5 stitches.
stocking stitch until knitting measures 7cm, then cast off.
For the legs (make 2)
Cast on 7 stitches
stocking stitch until knitting measures 10cm, then cast off.
Pin the two parts of the body with the right sides together. Sew together (back stitch) using the thread left from the casting on. Leave bottom for stuffing. Turn the body inside out then stuff with stuffing wool. Sew up the bottom. The edges of the arms will have rolled in, so they don't need to be stitched. Use small stitches to attach to the side of the body. As the legs are wider they may need small stitches to sew them (I didn't do this as mine were rolled in like the arms).
Attach to the body. Use ordinary sewing thread to make eyes and a mouth, or use buttons/beads.