Burial Rites

Humans: As varied as humans themselves. Cremation and burial being the most common.
Gnomes: Forrest: Buried wrapped in linen, with an acorn planted above the corpse. The decaying body acts as fertilizer for the young tree's roots. Rock: Bodies are entombed in great, hallowed family catacombs. The entrances to which are concealed with illusions. Only family and close friends of the deceased are allowed within (or are even able to locate them).
Halflings: Simple folk have an open casket wake, followed by cremation. Ashes are saved and spread among the fields during planting season. After the wake, it is customary to host a large feast that serves the deceased's favourite foods.
Wood elves: Similar to forest gnomes, whom they often share the woodlands beside, wood elves are buried in linen. The difference is that they are buried on the edge of their forests, adjacent to the tree line. They believe their bodies will help the woodlands expand.
High Elf: High Elves' bodies are placed inside intricately carved, water-tight coffins with their favourite books, works of art, and pictures of loved ones. The coffin is set adrift in large rivers and carried out to sea. The premature death of a high elf is so rare and infrequent that they generally prepare their ceremony for decades. It is even common for elderly high elves to plan the day of their death, usually drinking flavourless poison with a fine glass of wine. This is so that everyone invited can plan accordingly, and accompany the coffin on the funeral procession to the river.
Drow: Drow bodies are injected with a ceremonial poison that mummifies their remains. They are then wrapped in web-like linens and are kept as a reserve food source for giant spiders. If a body is to be consumed, the family hosts a small gathering to to witness the honorary occasion.
Dwarves: Dwarves are buried in many ways, depending on their caste and notoriety in life. Nobles and heroes would have the flesh and organs stripped from their bones and cremated. The ashes would be mixed with the adamantine used to encase their bones in a life-size statue. A devout dwarf is entombed in the mountain. A priest casts a ceremonial version of meld into stone on their body, magically becoming one with the mountain they called home. Lower class dwarves are cremated, and their family commissions metal-work in which the ashes are mixed. A warrior's ashes might be used in an axe-head, a good cook's might be in a cleaver. Still others are used in small statues depicting the deceased, made in the most valuable metal they can afford.
Dragonborn are buried beneath massive stone slabs. It is customary for a long poem about the deceased's life to be inscribed atop in draconic.
Tiefling largely follow the same customs as the humans they live among, but generally prefer cremation.
The body of a goliath is placed high on a mountain, and is consumed by vultures in a sky burial.
The body of a tabaxi is placed in a cardboard box and buried in a farm up north. A not-so-close acquaintance or appointed clergy generally handles the ordeal, while friends and family merely pretend the deceased is just on an extended holiday (in polite company at least, especially when children are around).