You can add a clasp by simply adding a loop of seed beads and one half of your clasp to each side of the chain. Make sure that you securely knot the thread and weave about an inch or two of thread into the chain before clipping and finishing.
Daisy chains are great ways to use bead mixes! Simply use a yellow or other contrasting color for the center of each daisy and use the seed bead mix to form multi-colored "petals" around it.