Thinly slice the cucumber. Using a mandolin is the quickest way to do this.
Spread 2 slices of bread with a thin layer of cream cheese. Sprinkle dill over.
Arrange the slices of cucumber on top of the cream cheese on one slice of bread. Top with the second slice of bread and either cut off the edges off the bread and slice into triangles, or use a cookie cutter to create sandwiches in fun shapes.