I made a couple of cucumber sandwiches the other day.
Sliced cucumbers, peeled, sliced tomatoes <--both from the garden.
I added a 1/2 of avocado smashed, salt and peppered lightly.

DH could hardly eat the whole thing!

We used those miniature crispy bread slices from the deli and made these for my daughter's wedding reception. Topped with a sprig of fresh thyme

I grew up eating them on pumpernickel with butter not cheese. I had some cucumber slices at a wedding once that had a small round circle of cream cheese then a dollop of apricot jam in the center. Loved them and make them for parties too.. inexpensive and fun.