For wedding or a baby shower if you go with the mini sandwiches you might want to do all "mini" food...mini pizzas, mushrooms stuffed with cream cheeses, stuffed cherry tomatoes, etc...and mini cheesecakes, just had them for Easter, superb! They were by Nancy's, $4.99 for the box of 32, all I did was thaw them for 20 minutes and top with a dollop of fruit.
And as far as Nutella...take 2 vanilla wafers, sandwich them together with Nutella and dip in melted white chocolate, let harden on parchment paper, yum!
Search "Shower Mini Food Recipes" for lots of recipes and ideas.
http://www.weddingbee.com/2009/09/25/mini-foods-shower-re... ~ recipes/ideas for:
Mini cheeseburgers
Mini BLTs
Mac ’n’ cheese in crispy prosciutto cups
Sweet potato fries
Mini hot dogs
Brownies and milk shots
Have fun! : )