A fun project, involving some sawing, cutting, glueing, etc. great for Halloween, or making friends with a marine biologist.
Doesn't take too long, and especially great if you like tedious work.
Stuff you need:
Thread (optional - 2 colors)
Felt - 2 colors
Sewing machine (optional)
Step 1: Measuring and Cutting the Fabric
First step - measuring the fabric and marking the pattern. I used a little scarf for the pattern. Basically it's 160 cm long, and 12 cm at the widest point in the middle.
For the fabric itself - I think a medium weight fabric would work best. Different colors could also work.