Cucumber Sandwiches For A Tea Party Bridal Shower

Has any one ever had cucumber sandwiches before?  I have heard of them but never have tasted any before.  My daughter volunteered to make them for a tea party bridal shower for her friend.  I have looked on line and have found different recipes.  Some of them have cream cheese and dill for ingredients.  I have found some recipes that say to put vinegar on the slices and slice the cucumbers very thin.  I have also saw a recipe to take the seeds out of them or use English or seedless cucumbers.  What is the best bread to use?  I wonder if anyone would know a great recipe we could use.  She would like them to look nice and taste good too!