This sterling silver crimp end cap from JBB is perfect for finishing memory wire. It crimps on securely to hold your beads in place, and even has a loop to attach your favorite charm or dangle. For extra security, sand the end of the memory wire and glue in place before crimping. The versatile silver shine will work with any color palette you have in mind.
These items are sold individually, but usually used in pairs. Make sure to buy at least two.