I going to bring you today one of the most basic beading techniques, but probably one of the most important too (I always use it), the peyote stitch.
In general I do it with delica beads, but can be done with other kind of beads. In this link you can see the explanation of this simple techinique. It is the same I used for the two pieces above.
For example this other link, show how to do a two-drop peyote stitch, with a result similar to the left bracelet (in this case is a three-drop peyote stitch). Finally, here you can find a lot peyote stitch bracelet patterns.