[As per these comments*, Dedalus sent everyone in the Order a pick-me-up in the form of a miniature illusion: upon opening the small, wrapped box (with a card labelled 'From Your Friend DDD!' in purple ink, just in case there was any confusion as to it was from), several conjured—but very realistic!—rabbits leap out and perform a quadrille before vanishing in a puff of rainbow-coloured sparks.
In the box are an excessive amount of cookie pops that compliment you when you try to eat them. No, he didn't really consider the fact that this was unnerving rather than helpful.
If that didn't help, a small bottle of firewhiskey was also included! (The whiskey was normal; drink up!)]
*Why deal with your own post-Dementor feelings when you can focus on others?