Change vvvv gui colors

i was checking a few videos on vimeo from the vvvv group, and i saw a pc where the vvvv background was in another color, and also the nodes,
i saw also something on the user pages long time ago, but i dont find the link,
can someone send me the link or show me how to do it ?

use the kalle node for backgorund color

colored nodes are still a dream, you probably saw some boygrouped blue nodes

and try CTRL-H on selected nodes.
and then try CTRL-E…

but better not use me in patches.
i myself prefer to keep it gray.

HowTo make nodes blue: Boygrouping