I love innovation like this sign by johnwgolden at etsy. We have ways to be efficient in every other area of our lives–why not with the nagging? I’d imagine that you’d have to move the sign once a week or so for it to have maximum impact.
Stumble it! 
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Did you see the rest of these posters? I fell in LOVE with them. They are on my favorite list…although I’ll probably never be able to afford any other than the tiny ones.