1/3 yard fabric A; 1/8th yard fabric B ( approx ); scissors; sewing machine; needle and matching thread; soft fibre washable stufffing.
( for template : card, pencil, compass, ruler; scissors )
1. make the template:
Start from a Rt angled corner of the card ( or draw one ). Put the compass point in the extreme corner and extend to 4" length along one straight edge. Scribe an arc to the other side of the card. ( don't shut the compass! ) This is part A for fabric A.
Next using the same arc draw both side of a straight ruled line to make part B for fabric B. Cut out accurately. ( to check your parts are going to match up lay part B over part A ; the curved side should match. )
2. Cutting fabric: Lay template A economically on fabric A and cut 24.
Lay template B on fabric B and cut 12.
Thus; With right sides together lay one part B curved edge to part A curved edge. Pin. Sew 1/4 inch seam beginning and ending 1/4 inch in from point ; backstitching at each end.
Now with right sides together lay the curved edge of other side of part B to a second part A. Pin . Sew with part B uppermost so you can see your first seam. Now sew the arc around to meet up with your first seam.
4. With right sides still facing in, pin together the 2 straight sides of the 2 A parts. (the piece still looks like the shape of part A with part B like a gusset in between. )
5. Start sewing along one straight side; turn at the right angle cornerand sew about an inch. Stop backstitch. Leave a gap of about 2" ( for turning and stuffing ) sew the rest of that side to the corner backstitching at each end ( so it won't undo while it is being stuffed ). Trim threads and corner off.
6. Turn shape right side out.
8. Pin the gap shut and hand stitch closed.
9. Assemble ball. Take 3 parts and hand stitch the pointed ends together. Repeat 3 more times. So 4 bunches of 3.
Now join all the bunches together at the pointy ends.
(That is part way there ) getting all 12 parts joined in the centre is the trickiest part of the project.
10.Finally group the parts into 4s, like a cross pattern and firmly stitch 2 opposite parts together then the other 2 parts together.
With some twisting involved do this again with 4 more and a third time with the final 4. Now all 12 parts should be secured to each other and hopefully you will have a ball looking like this.