The bands that inspires me most while sketching are the ones that have a strong ambient feeling : they help me get motivated while blending into the background.
Bands like Air, Bjork, The Cure, Thievery Corporation, Manu Chao, Tom Yorke’s solo album…etc.
But if you want a good advice you should listen to whatever Karim listens to :
http://www.amazon.com/Karim-Rashid-Newyorkelectronew-Various-Artists/dp/B00009PJNR