As a doily, I recommend using #10 cotton, as a framed wall hanging I suggest #20 or #30

** Crochet cotton #5**
Hook: 4
Yardage: 1232
Approx. size: 29.6x28.5 inches
Gauge: 10 squares = 2.8”, 10 rows = 3.2”

** Crochet cotton #10**
Hook: 7
Yardage: 1098
Approx. size: 24.6x22.5 inches
Gauge: 10 squares = 2.3”, 10 rows = 2.5”

** Crochet cotton #20**
Hook: 9
Yardage: 1030
Approx. size: 23.5x21.6 inches
Gauge: 10 squares = 2.2”, 10 rows = 2.4”

** Crochet cotton #30**
Hook: 11
Yardage: 963
Approx. size: 22.5x20.7
Gauge: 10 squares = 2.1”, 10 rows = 2.3”