A finished bracelet is 19cm long. 
Materials:
- Cotton yarn. I used 425 m/100 g cotton yarn of the following colours: green, yellow, orange, brown, blue. You may use any left over yarn as the consumption is minimal. You may want to be creative and use different colour for the butterfly wings.  
- A crochet hook, I used 1,0 mm crochet hook 
- A sewing needle, matching sewing threads
- A Button
- A small amount of hollow fiber
Abbreviations:
ch – chain
sl st – slip stitch
sc – single crochet
hdc – half double crochet
dc - double crochet 
inc – increase (2 sc in 1 st)
dec – decrease (single crochet two stitches together)
 (...) x N times – repeat instructions in brackets N times

Butterfly Wing (make 2)
Any suitable colour
8 ch
1) starting from 3rd ch from hook: 2 hdc, 2 sc, 2 sl st, 1 ch, turn (6)
Work every following row into the back loops only.

2) 2 sl st, 2 sc, (2 hdc in 1 loop)х 2 times, 2 ch, turn (8)
3) 3 hdc, 3 sc, 2 sl st, 1 ch, turn (8)
4) 6 sl st, 6 ch, turn (12)

5) starting from 3rd ch from hook: 4 hdc, 4 sc, 2 sl st, 1 ch, turn (10)

6) 2 sl st, 4 sc, 2 hdc, (2 hdc in 1 loop)х 2 times, 2 ch, turn (12)
7) 2 hdc together, 5 hdc, 3 sc, 2 sl st, 1 ch, turn (11)
8) 2 sl st, 3 sc, 4 hdc, 2 hdc together, 2 ch, turn (10)
9) 2 hdc together, 1 hdc, 2 sc, 5 sl st (11)
Bind off, cut off any excess yarn.

Work sc around the wings with a contrasting colour yarn from spot A to spot B

Butterfly Body - Head
Crochet with brown colour yarn.
1) 6 sc in a Magic Ring
2-8) 6 sc

9) Work into the front loops only: 6 inc (12)
10-11) 12 sc
Stuff the head lightly. Do not add any hollow fiber into the body. 
Crochet the butterfly's antennae in the next round. 
12) 7 ch, starting from 2nd ch from hook: 6 sl st, 1 sc, 2 dec, 1 sc, 7 ch, starting from 2nd ch from hook: 6 sl st, 1 sc, 2 dec, 1 sc (8) 

Cut off, bind off. Hide the end of the yarn inside.
Sew the wings on. Hide the yarn ends inside the body. 

Bracelet.
Work with green colour yarn. 
4 ch
1) starting from 2nd ch from hook: 3 sc, 1 ch, turn (3)
2) 3 sc, 80 ch, in 9nd ch from hook: 1 sc (this is a button loop), (8 ch, skip 8 loops, 1 sc)х 8 times. Work the last sc into spot А.

Work sc around the part from spot A to spot B. 
3) (work along the chain: 2 sc, inc, 2 sc, inc, 2 sc; crochet a leaf: 1 sc, 6 ch, from 2nd ch from hook: 1 sl st, 3 dc, 1 sc; work along the chain: 2 sc, inc, 2 sc, inc, 2 sc; 1 sc)х 4 times

Work along the button loop: 8 sl st;
Work along the other side of the bracelet:
Work along the chain: 2 sc, inc, 2 sc, inc, 2 sc; 1 sc; (work along the chain: 2 sc, inc, 2 sc, inc, 2 sc; crochet a leaf: 1 sc, 6 ch, from 2nd ch from hook: 1 sl st, 3 dc, 1 sc; work along the chain: 2 sc, inc, 2 sc, inc, 2 sc; 1 sc)х 3 times; work along the chain: 2 sc, inc, 2 sc, inc, 2 sc.

Fasten off, cut off. If you want to make your bracelet shorter/longer, then instead of 80 ch make 9ch or 18ch less/more. 
Straighten and iron the part very gently. 
Sew the butterfly onto the centre of the bracelet. Sew the flower next to each leaf as shown on the photo. 

Flower (make 4)
Start with yellow colour yarn.
1) 5 sc in a Magic Ring
Change the yarn to blue or other colour of your choice
2) (in 1 loop: 3 ch, 2 dc, 3 ch, 1 sl st; 1 sl st in the next loop) х 5 times.
Fasten off. 

Sew on a button. The bracelet is completed!