I follow Buddhist ethics, prayed to Ratnasambhava Buddha to guide and protect the backyard qua refuge, and want to make a miniature flower-box stupa for insects/birds. Regarding the miniature flower-box stupa, note in the Lotus Sutra, the Buddha says:

Those who made rock stupas,
Stupas out of sandal, aloe, deodar, and other woods,
As well as brick, tile, mud, and other materials;
All those who made buddha stupas
Out of piles of earth in desolate places;
And even children in play
Who made buddha stupas out of heaps of sand—
All such people have certainly attained
The path of the buddhas.