The best part of using precuts, like jelly rolls, honey buns, turnovers, charm paks and layer cakes is that all the fabrics in them are from the same fabric line, so they all coordinate. Just add one of the fabrics by the yard and your project is automatically one where all the colours and patterns work together.
Just remember to shake the daylights out of them before you start using them to get rid of all the edge lint, just hold the whole pak and shake it until the 'dandruff' stops. :)