I was looking for a novel way to present overdue notices; but could only produce a novella. (It's OK to laugh here ... I did.)
Anyways, it occurred to me that one problem with the effectiveness of such reminders is that being generally small and flat, they tend to get lost. OK, they get thrown away in many cases, particularly by recurrent recalcitrants. Making them bigger would only lead to the backs being used for shopping lists, or plot outlines - dependent of course on the identity of the defaulter.
That left only the option to change the shape - but into something that might be considered "fun" for the sender as well as the recipient. I have not patented this idea, nor do I intend to do so. You have my blessing to use as-is, adapt, modify or otherwise alter in any way to suit your purpose.
However, given the recent past history of my more creative innovations, it may be best to check with the NSW government to see if they want to claim copyright on this, me being an employee and all ...
You can find one set of instructions for making a Creative Overdue Teller here, but please note I have no affiliation with that website and do not receive any pecuniary rewards from same. It was the first one to come up on a Google search for "fold fortune teller".
Disclaimer: I am not cognisant of my employer's relationship with the above linked website, although I am given to understand there is a financial relationship between them and Google.