Bob's Red Mill offers an easy muffin recipe on the back of each bag of White Rice Flour. The recipe is great for beginners and it is one we use frequently in our house. Here are some of the ways I modify the recipe to keep it new (and sneak in some fruits and veggies).
I use apple juice for the liquid and cut the sugar in half. Add in fresh minced carrots and/or zucchini with a bit of cinnamon and nutmeg.
Use orange juice, cut the sugar in half and add in dried cranberries.
Use your favorite milk substitute, add a little vanilla extract and dried blueberries.
Have fun experimenting!