When You are attuned to God, as a believer You may bless everyone and everything You want, as far as You feel it is according to the will of God *). There is not only the usual priestly blessing of Numbers 6:23 - 7:1 :
Speak to Aaron and to his sons, saying, 'This is how you shall bless the children of Israel.' You shall tell them, 'God bless you, and keep you. God make his face to shine on you, and be gracious to you. God lift up his face toward you, and give you peace.' So they shall put my name on the children of Israel; and I will bless them. It happened on the day that Moses had finished setting up the tabernacle, and had anointed it and sanctified it, with all its furniture, and the altar with all its vessels, and had anointed and sanctified them; 7:2that the princes of Israel, the heads of their fathers' houses, offered...
YOU can spread blessings. You need no formula, and You don't need to speak it aloud, but the right attitude, like "be blessed as the Lord wants ..." . God will not do anything false with Your blessings. This custom has become rare today, but it might be important.
There are many bible places
concerning blessings. Some typical ones:
Zecharja 8:13 : It shall come to pass that, as you were a curse among the nations, house of Judah and house of Israel, so will I save you, and you shall be a blessing...
Acts 3:26: God, having raised up his servant, Jesus, sent him to you first, to bless you, in turning away everyone of you from your wickedness.
Ephesians 1:3 :Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ.
1 Peter 3:9-11 : Finally, be all like-minded, compassionate, loving as brothers, tenderhearted, courteous, not rendering evil for evil, or reviling for reviling; but instead blessing; knowing that to this were you called, that you may inherit a blessing. For, he who would love life, and see good days, let him keep his tongue from evil, and his lips from speaking deceit. Let him turn away from evil, and do good. Let him seek peace, and pursue it. For the eyes of the Lord are on the righteous, and his ears open to their prayer; but the face of the Lord is against those who do evil.
Some more bible places: Deuteronomy 11:26; Psalms 115:13; Proverbs 11:25; Matthew 5,44; Hebrews 6:7.
*) For instance if weapons are blessed, the angels might have problems with that "blessings"...
Such short quotes from the Bible - based on different translations - are additions to the corresponding chapters of the
However, such characteristic places cannot fully replace the study or meditation of whole chapters of the Gospel(s).