[NeoCZ]

Yes, I use blue background color and I see why it might not look that good with it. However, I still prefer transparent background that changes based on user background color. Also one idea -  what about white circle around MobileSheets icon? See attached image, it's tile of FeedLab and it looks great even with blue background.. 

   

EDIT: I've noticed FeedLab changes also it's "inside" colour and only white parts remains the same.