I like Yakuake, but I don't like the grey background color. I want to change the background and text colors of the Yakuake terminal.
I checked the options, but the background color option is only changing the bottom tab bar.
You should open the menu of Yakuake. As far as I understood correctly you only tried changing color in:
But there should be also
There you can choose a profile for the shell in Yakuake and you can set several colors in the same way like you can do in Konsole.
A quick google search will give you may be an answear : http://williamarchibaldspooner.wordpress.com/2011/03/27/install-yakuake-ubuntu-installation-and-set-up-guide/