the nest is not grouted.
see this post to find out about creating his nest:
a multitude of found items went into the nest - along with some strands of beads and some large wooden beads, buttons and other tesserae
the tree limbs are broken tile that looks like wood
The raven is a variety of blank and gold beads
the tree leaves are different colors of green stained glass, faux pearl and glass beads, faux gems and a whole bunch of plastic silver leaves from some cheap jewelry from the $1 store
and a few pieces parts from bracelets, etc.s