During September in much of Northern Hemisphere, little purple daisy-like flowers ("asters") are in bloom. Across Europe, especially in England, they are often referred to as "Michaelmas Daisies." This is due to their on-going blooming over the feast of St. Michael and All Angels on September 29th.
The Bible does not say as much about angels as some people might assume. But it does say some important things. One thing to note: humans do NOT become angels when we die. Angels were always created to be spirit only and are the servants of God. We were created to be both physical and spiritual. Though the physical must go into the earth for a while at death, due to humanity's fall into sin, the body will be raised at the end of time. We are not only servants of God: we are also His children. When the angels fell into sin, they became the demons that are cursed forever. There is no salvation plan for them. On the other hand, God sent His Son (who is also God Himself) to become human and to die for our sins.
Michael is a powerful angel who shows up in the books of Daniel and Revelation. He is also briefly mentioned in Jude. His name in Hebrew means "who is like God?" ["Micah" is a related name. It means "who is like Yahweh (the proper name for God)."] Michael fought in the great war in heaven after Satan rebelled against God, before humans were tempted.
Gabriel, whose name means "God is my Strong Man", is the other angel with a name. He appeared to Daniel in the Old Testament. His main appearances were around the time of Jesus' birth, making announcements to Zechariah, father of John the Baptist, and making the announcement of Jesus' coming to His mother, the Virgin Mary.
Other angels serve in other roles. Some are, indeed, our guardian angels. Four remain around the throne of God. None is described in the Bible as the cutesy little Valentine cherubs.
Here is some Biblical poetry for you to enjoy over this happy festival:
For He [God] shall give His angels charge over you,
To keep you in all your ways.
In their hands shall they bear you up
Lest you dash your foot on a stone. (Psalm 91:11-12, original translation)