Materials:
Green yarn of different colours
Brown yarn
A crochet hook
Hollow fiber
Cardboard
A sewing needle
Beads
Sewing threads
 

Abbreviations:
ch – chain
sc – single crochet
inc – increase (2 sc in 1 st)
dec – decrease (single crochet two stitches together)
(...) x N times – repeat instructions in brackets N times

Crochet with brown yarn
1) 6 sc in Magic Ring
2) Into the back loops only 6 sc
3) 6 sc
Add hollow fiber.
Change yarn to green colour.
4) Into the back loops only 6 inc (12)
5) (inc, 1 sc)х 6 times (18)
6) (inc, 2 sc)х 6 times (24)
7) (inc, 3 sc)х 6 times (30)

Cut a cardboard circle the same size.

8) Into the back loops only 30 sc

Next, change the yarns as you wish, in each row or through 2 rows.

9) 30 sc
10) (dec, 8 sc)х 3 times (27)
11) 27 sc

Put the cardboard detail inside
12) (dec, 7 sc)х 3 times (24)
13) 24 sc
14) (dec, 6 sc)х 3 times (21)
15) 21 sc
16) (dec, 5 sc)х 3 times (18)
17) 18 sc

18) (dec, 4 sc)х 3 times (15)
19) 15 sc
20) (dec, 3 sc)х 3 times (12)
21) 12 sc
Add hollow fiber.
22) (dec, 2 sc)х 3 times (9)
23) 9 sc
24) (dec, 1 sc)х 3 times (6)
25) 6 sc
Add hollow fiber.
Pull off the loops. Cut the thread, hide the end.

Sew beads in a spiral. Or decorate as you wish.
Sew the loop.

Christmas tree keychain is complited!