I keep finding these tiny white sort of angular shaped cocoons or egg sacs on trees. I finally paused to look more carefully and found a mommy spider guarding her eggs.

 She sort of reminded me of a growling poodle, except a poodle bit me once and I wouldn't want to tangle with another. I'd play with these spiders again.

I've found these spider eggs on trees, bushes, and low growing ground cover plants, including Firebush, Cassia, and Black-Olive. I've mostly seen them on the top of leaves, but I found these on some dead twigs: