Another thing that I have been advised to do is to put a bowl of rice(uncooked) and a bowl of water outside the compound of my house just before I start my meditation.This is an offering to the spiritual world and an attempt to avoid any spiritual disturbance during meditation.Before I put the rice and water outside, I stand in front of my altar and say, "Lords, please bless this rice and water which is for the sentient beings outside my compound. Kindly bless this rice and water so that their suffering would end, their wisdom would open up and so that they may get enlightened before me." Then I visualize holy light coming from the Buddhas onto the rice and water.After that I place the bowls outside. Then in the morning birds come to eat the rice and drink the water.A big party outside my house every morning.
I have been also told that the Buddhas love flowers above anything else(of course without any attachment).In fact,They come down to earth in the smell of flowers, not the strong smelling flowers but the ones with the light scent.Fresh flowers don't last so it's better to change them every week.
Coming back to the altar, I light an incense stick before leaving the house telling the Buddhas where I'm going and do that again when I return thanking them for being home safely.In this way the relationship is better and more meaningful.