Design is tricky
I need a drink. Not just tea. A bottle whiskey. Thats how gtreat design happens, I'm sure.
Ideas I've recently backed away from:

Having the background of the GUI coloured like some pyschedelic swirly pattern thing based on your mood

Having the game summarise your day at work in Haiku form. (still like this idea).

Listening to octavarium on loop helps me no end. I could have written a standard tycoon or strategy game by now. This will either be something very special, or a HUGE waste of time...