The occasion of the anniversary of your birth is a time for celebration and solemn contemplation. I hope these will help you with one or the other!
Your friend, Luna Lovegood
Enclosed: An assortment of extremely large candles (large enough that the package was quite an encumbrance for the owl), with the candle wax moulded in various shapes. There are two of each type. When lit, the candles shaped like castles will disgorge and dragon and a knight, who will argue philosophy with each other and anyone nearby, until the candle is snuffed out. The candles shaped like boxes will open up and fold into different patterns like a 3D kaleidoscope; it can be quite mesmerising. The candles shaped like bombs will blow up, and each little fragment will turn into cold-burning (and therefore not a fire hazard) fireworks that rocket up to put on a five minute fireworks show near the ceiling. The candles shaped like a chess queen will expand into a whole chess set and replay famous games, a different game for each candle.
The instructions that explain all this must have been misplaced, because they're not included.
Also included (later, since the owl couldn't carry it all in one trip), a box of homemade biscuits shaped like party hats.
Also included, under all the biscuits, a book about the history of tea.