The trouble with stickers is that they have a limited 'shelf life'.
They are funny when you are one of a few with it on your van, but once everyone else has got theirs off of eBay the novelty has gone.
The "Dementia", "Home Is", "One life", "Old Age" etc etc have had their day.
I used to have "Jesus Is My Airbag" on my old 60's VW but that managed to offend a couple of people.
As the "cool" VW brigade find it amusing to ask if I'm selling ice creams when I'm parked up in my white high top, I was thinking of getting a "Mr Whippy" sticker along with a picture of a cone with a flake for my van.