I do not use a color theme throughout the book. I go with what works with the pictures and memorbilia.
If several pages are from the same event I tie them together - I'm doing a 5 page Everglades that ties together. But other than that my pages are individual.
They may have Easter which has its own colors and then 4th of July with those colors. SOme with clothes I really want to emphasize by coordinating my papers or flowers that are so pink I have to use pink paper with them.
I like them individualized and only tied together if the theme is the same.
I don't care what colors I picked to do my colors and theme, there will be some pictures that just don't work. ANd I love to use Christmas papers for Christmas and Easter papers for Easter - travel papers when we travel. Its just fun to me.