I suspect the idea to leave an offering to the leprechauns wasn't merely a childish invention but a genetic or past-life memory of Old World customs. It's said that many people left milk outside the front door every night "for the fairies" (to curry their favor and entreat their assistance), and that other offerings of food and beverages might be left inside for the "house fairies" or "house brownie (spirit)."
What's more, in countless cultures and ages, people have offered things such as food, beverages, and fragrant smoke to gods, goddesses, ancestors, and spirits of the land.
In addition to placing offerings on an altar, here are some ideas for ways you might make offerings to helpful beings in order to invite their presence and request their assistance in keeping your home safe, blessed, and energetically fine-tuned. Feel free to put your own spin on these.
- Make an offering to the fairies and spirits of the land by getting a bird feeder and keeping it stocked with fresh bird food or nectar.
- Leave whole grain breadcrumbs or cooked rice out for the air spirits (and birds).
- Leave unsalted nuts out for the spirits of the earth (and squirrels).
- Place walnut shell halves filled with beer, cider, or champagne outside in the garden or yard - it's said that fairies love bubbly party beverages.
- Hang wind chimes near your front door and offer their sounds to the angels.
- Light incense and offer its fragrance to God/dess.
- Pour a glass of wine or cider and place it on the dinner table as an offering to the earth. After dinner, go outside and pour it near the base of a tree.
- Plant and tend an organic garden or outdoor potted plants to summon fairies (and also ladybugs, birds, bees, etc.).
- Bring potted plants into the house to call in nature spirits.