These include little floating objects seperate from a Whiffling's body relating to their scent, see Rainwater's rainclouds. They're more illusory than anything, but can have small effects (like causing small rains near them). Please Note: These need to include only one shape/object [though the color can vary, for example with flowers], and generally be simple in form. If you want multiple types of Scent Decorations you'll need another Fae Trait [Potion] to use for it.
The exception seperate "bits" being scent decorations are in reference to bits of liquid tail/body aspects that are not floating independently of the body, but as liquid sometimes splashes/moves may appear temporarily separate. Liquid still cannot float of its own will, or otherwise move around like scent decorations can. If we see the depiction of such, we will ask for a trait addition on your design. Please see Pink Rose Tea and Witch's Brew as examples for seeing liquid-themed Whifflings that have this exception. Again, these drops can't act independently/don't float, just can appear since these areas are liquid in nature.