My favorite backyard bug here in Mountain View, CA is the green fig beetle. They're about an inch wide, an inch and a half long, and bright metalic green. Hilariously clumsy fliers, they bump into all sorts of things.
The grubs are quite large -- a couple of inches long, normally curved into a C shape. When placed on the surface, they uncurl and crawl away on their backs, with their legs pointing skyward. A bunch of the grubs live in our compost pit, though I seldom see the adult beetle. None so far this summer.
Update on 3-Sep-2005: Here's the URL for a short silent movie I made of
the grubs, if anybody is curious what they are like:
The Grub of the Green Fig Beetle