  Nilpotent Lie groups with left-invariant metrics provide non-trivial examples
of Ricci solitons. One typical example is given by the class of two-step
nilpotent Lie algebras obtained from simple directed graphs. In this paper,
however, we focus on the use of quivers to construct nilpotent Lie algebras. A
quiver is a directed graph that allows loops and multiple arrows between two
vertices. Utilizing the concept of paths within quivers, we introduce a method
for constructing nilpotent Lie algebras from finite quivers without cycles. We
prove that for all these Lie algebras, the corresponding simply-connected
nilpotent Lie groups admit left-invariant Ricci solitons. The method we
introduce constructs a broad family of Ricci soliton nilmanifolds with
arbitrarily high degrees of nilpotency.
