some people choose 30 different fabrics- others buy yardage and narrow down the selection (30 fq's = 7 1/2 yards)
some choose 15 and get 1/2 yards---
it is up to you what you like- if you want it all different it's ok- if you only want to use 2 colors you can do that too. everyone has their own color sense- some like busy- lots different - some not so much