I felt a lot of thrift store sweaters, so I often have a little from this sweater, a little from that sweater.  I have found that creams are one of the hardest to coordinate.  You have to be real careful which creams you use together.  They can look dirty, yellowed, or pale by turns.  When I start a project where I need a lot of cream felt I make piles of all the creams that look good together before I get started.  Grey felt doesn’t have this problem at all.  Most grey felts can mix without a problem.