There's many messes I mind. Such as spilling a quart of homemade maple syrup on the floor (my fault...and my helper kept saying "Mama, mess" and "Uhoh, mess"...thank you for the narration, little guy). I also mind cat hairballs. I don't enjoy a cleaning a smoothie spilled on a rug. I could do without sweeping the piles of pet hair that accumulate on our stairs. But, nevertheless, there are some messes that I don't mind at all, and in fact they make me smile.
And I love piles of books that develop not out of carelessness, but because there's just too much to read to be bothered to organize. I love, love, love finding my independent reader deeply engrossed in a book of choice. Yes, I don't mind these sorts of messes at all.