This is an easy project, which you can complete in a matter of hours while the baby sleeps. Hope you will enjoy it as much as I did.

Step 1: Materials

Besides a sewing machine, scissors and thread, you'll need:

cotton fabric

bias binding
(is it really called that? - I'm from Copenhagen, so please excuse any weird words ...)
two (wooden) rings (but they are not really necessary)

Step 2: Make Cardboard Triangle and Trace It

Oops! I forgot to tell you, that you'll also need a pen and some cardboard or some paper...

create a triangle-shaped cardboard/paper template
(the one I made was 10 cm x 14,5 cm = 4 inches x ca. 6 inches)

fold the fabric on the middle.
It's important that the reverse side is up

place your triangle template on top of the fabric and trace it with something
- preferably a pen or a piece of chalk
continue tracing until you have enough triangles

Step 3: Cut the Triangles

Cut out the triangles with a pair of scissors

Step 4: Sew the Triangels Together

Allright.
Now you're hopefully ready to sew the triangles together like so:

take two triangles and place them one on top of the other
- "back to back" or "reverse against reverse"

sew the edges together

Step 5: Sew the Triangles and Bias Binding Together

Fold the bias binding on the middle (leave 10 cm/ 4 inches of bias binding in each end for attaching the rings) and put a triangle in the fold. Now - sew!

Repeat until there's only 10 cm/ 4 inches of bias binding left.

Remember to fold and sew the beginning and the end of the bias binding as well.