An orange peel with olive oil in it, stem burns like a candle, and remains decompose afterwards (honestly any oil will do if you don't have olive oil specifically but it works best)
A journal, write to your deity in it (you can get a little creative with this one, it can be physical such as a traditional journal or scrapbook or you could make a discord as a way to "talk" to them everyday or something like that)
Write them letters and burn them (or bury them*, or put them in a folder, or rip them up and throw them in the wind* or a river *as long as the material is friendly to nature. This also depends on the nature of the deity)
Poetry! You can speak it out loud or put in in a digital folder, but I personally put in in a decorated envelope on their altar space.
Tea, just make a little extra when you make some for yourself.
Rainwater, moon water, snow water, etc.
Origami, paper also decomposes outside
Sigils, make one for them and draw it on you as often as you'd like
Playlists (or you can sing to them/play music yourself)
Pinterest aesthetic boards
Art in general (this includes theatrical arts)
Talk to the moon at night (specifically for night related dieties) OR lay out in the sun
Depending on the pantheon, you can consume foods as an offering
(This one is little weird for some but if you have reptiles, certain deities do appreciate sheds)
Certain deities will also enjoy helping you in your craft, you can request guidance if you want to use learning as a devotional act itself
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