Gifts of food are almost always appropriate. Something good happens, bring food. Something bad or sad happens, bring food. My neighbor's wife has a house full of people to feed with all their family here to support her, so I wanted to bring something over to help a little bit. Muffins seemed like a logical choice, everyone likes muffins. Plus I went a little overboard with the buy one get one free on blueberries this week.
I used the same Martha Stewart recipe as I did a few months ago, but used half blueberries and half strawberries for the fruit.
I'll let you use the directions from the boss, herself. I will add that whenever I make this recipe, I end up with enough extra batter to make one giant muffin at the end. Maybe I'm not filling the cups enough. The giant muffin was good for testing to make sure I was giving an edible gift.