I used to think that way about "mistakes". Now I see them as creative opportunities! You are looking at the fabric in only one way. The trick is to start thinking outside the box.
One idea would be cut all the strip sets into strips of varying widths and do a crazy quilt with strips sewn to a muslin foundation. All the colors will still go together, but the pattern will be different.
Or, sew together the blocks that are the same size, then subcut into 5" squares and make a Falling Charms quilt:
http://www.youtube.com/watch?v=4KkpbFKBaKA . (Note that the sashing strips for this quilt can be a width other than 2.5". In fact, for me, 2.5" gives too much sashing and next time I will use 2" strips.)
Or, sew together the blocks that are the same size, then subcut into any shape that you like -- for example, triangles to make a pinwheel quilt. All the different colors in the triangles would make an interesting pattern.
Along the same lines, you could sew blocks of the same size together, then subcut into dresden plate shapes, alternate them with a plain color, and make circles.