I have always been a strong advocate of delivering a THANK YOU leaflet following the election, regardless of the outcome. Having bombarded residents with paper asking for their vote, the least we can do (win or lose) is thank them for their support.
This year I have designed a nice, good quality card sent jointly from the local council candidates and the MP. It includes a perforated tear-off freepost reply card inviting residents to sign-up to be "Registered Supporters".
This is how the front of the card will look on the doormat:
This is the front once opened out
And the reverse, localised for each ward
Please let me know if you would like a copy of the InDesign file for use locally.