He is a blank slate on which you can write anything.
She sounds like a blank slate waiting to be written upon.
My memory of the original is that his earlier life was a blank slate.
Rather than starting from a blank slate, go through each and add those that are specific to their organization.
"You go in with an open mind and a blank slate," he said.
The number of times we start with a blank slate these days is pretty small.
"I was a blank slate, and the whole world opened up."
He was raised as a blank slate, with no religious influence from his parents.
No one had done that before because it was so much easier to work with a blank slate.
It's this blank slate, I can't even remember what happened.