The Princess Party Cookbook is really good as is the Party Planner. Avoid the jammie dodger hearts they will make you want to punch something for a prolonged period they are so fiddly..... Sausage hedgehog is very easy and popular, cheese/cucumber croc also nice and my OH loves doing the jelly boats, he spends ages cutting the sails just right
Failing that cut sandwiches out with cookie cutters into shapes, whack some crisps into a bowl and do some choc crispy cakes
Stinky put a good spread on for JM's party this year, even did a cake in a box. I always seem to get carried away with party food and do too much but the adults always seem willing to help eat everything.