I would definitely bake the day before, especially if it is a big quantity, and ice the same day. Just store them well and they should be more than OK. The internet is a good place to be inspired, you can also get great ideas here by searching for what you like. There are puppy cupcakes posted yesterday here if you want to check them but they are not blue. Regarding flavors, it all depends on how many you are making; if it’s a large quantity, it is nice to have more than one flavor. You can vary the color of the icing too by tinting them in different colors matching the puppy for example. Go with a recipe that you are familiar with and that you have tried many times; if you want to try a new one, make it at least once before the venue so at least you know how it tastes… Good luck; I am sure you will do great because you are doing it for your grandson :-)
Dina @ miettes, http://www.facebook.com/pages/miettes/257790597632317