Blank Canvases

Sometimes when I have a stack of blank canvases on my art table I feel like I have no ideas left in my head. I almost feel as if my brain is a blank as the canvases sitting there. I have so many ideas when I am out of things to paint. I just wish that they would stay there long enough to get them down. When I look at them I think about how white and think It would be almost like pure snow.