Drawing mandalas can easily lead to thinking about symbols. The circle itself is a rather fascinating timeless symbol of wholeness and unity. The hand is a symbol of protection. There are many intricate artworks featuring the hand or its more stylised symbol the hamsa - check these out if you are interested.
I chose to draw around my own hand today. That feels good partly because it is the sort of thing you do as a very small child and partly because it makes your mandala very personal, almost like your fingerprint.