Step 1: Supplies.
For the bracelet I'm using memory wire; for the necklace I'm using beading wire (the picture shows black, but I changed to silver as it looks nicer in the clear tubing). A colored wire would also look cool through the translucent tubing.
Step 2: Rubber Tubing
While my beads had holes large enough to go over the tubing, they would slide around. If you only want them at the center of a necklace, that would be fine, but I wanted them spread out evenly, so I then cut the tubing into sections. It kind of gives the illusion that the tubing goes through the beads; this would also work great on beads where the holes are too small for the tubing.
Step 3: Alternating Beads and Tubing.
Step 4: Bracelet, Finished
You could add crystal dangles, charms, etc.