What to do with all that leftover yarn

I picked up a copy of Mini Skein Knits from the library as it looked interesting and useful. While I probably will not directly knit any of the patterns, they do give a knitter lots of ideas for small skeins and leftovers.

One oddity about the book is it provides instructions on how to make a knit stitch, a purl stitch, an increase, a decrease, how to cast on and bind off, etc. But nowhere are there instructions about colorwork, which abounds in the patterns. I don't find Fair Isle to be all that intuitive, but hey, maybe that is just me.