Note: Throughout this Instructable, I may refer to 'the fuzzy side' of the fabric. This just means whichever side of the fabric you want to face outward when the project is done.
Step 1: Materials:
Fabric of your choice
Peg-and-washer plastic eyes
Cotton Batting or stuffing
Needle and thread
Sewing machine (optional)
They have everything at Ikea :) Too bad I don't live near one...
Step 2: Cut Out the Shapes
Below: The two shapes are cut out and pinned together for sewing. (with eyes attached)
Step 3: Attach the Eyes
Sew the buttons onto the fuzzy side wherever you want the eyes to be.
Below: Close up of the peg-and-washer eyes
Step 4: Sew It Up
Below: Sewing up the edge.
Step 5: Stuff It
If you want your protozoa to have a different feel, or don't have stuffing, you can use fabric or felt scraps cut up into small pieces as you can see in the pictures. Use the fabric pieces in the same way you would use cotton batting or stuffing.
If anything is unclear or if you notice mistakes, please don't hesitate to comment.