In my opinion the lxde colour should be yellow because when I think of a light(weight) colour for me it is yellow. And no big DE/distro uses yellow.
My contribution for today is a simple yellow theme. It consists of a murrine-based GTK+ theme and a matching openbox theme. Additionally I made a yellow version of the gnome-colors icons.

- lxde-1.png (38.16 KiB) Viewed 246923 times

- lxde-2.png (30.53 KiB) Viewed 246923 times
Of course I could easily make it in an other colour.
For those of you who want to test it:
Just put the folder in ~/.themes/
I didn't include the icon theme because it is quite big and I'm not sure about the license.
Abaca