Beat cream cheese, sour cream and salt together with a fork until smooth and spreadable.
Spread the cream cheese mixture in a thick, even layer (about 1.5 cm deep) across a large flat board, leaving a 2 cm border.
Press the rectangular crackers upright into the cream cheese at irregular angles and spacing, pushing each one in about 1 cm so it stands firmly.
Place two or three olive rounds on each cracker to suggest RIP lettering or a cross shape.
Scatter crumbled dark rye crackers across the cream cheese between the tombstones to create the soil effect.
Dot cherry tomatoes and baby carrots around the outer border of the board.
Serve immediately, or cover and refrigerate for up to 2 hours.