I am using 4 fabrics on the next quilt block but I also have a little bit of a fifth color also. so if you are wanting to put aside fabrics then you should plan on 5 diff fabrics.
I'd have to stop and think how much of each one for a whole year of blocks. I don't have them all designed yet. I usually just do them along the way through the year.
It's not the same as a published sampler quilt.