Flannel boards are great addition to any story time. They are engaging, interactive, and well, fun! I personally have spent a great deal of times creating a flannel board for a particular topic, just to have it sit in a drawer until the topic came up next year.
While I was doing some browsing I came across this great idea by Leah K from Sunflower Storytime. Leah created a cute penguin flannel board for her penguins and polar bears storytime and then turned it into a color matching activity for her little learners! You can print Leah's board and get other great ideas here.