I've only been playing for a couple years but I came across the furnishing items from the Pictlogica crossover event and I absolutely love them.
I know some events loop back around but from what I can tell these were never re-issued outside of the event in 2014. There are probably more logistics around bringing back crossover events than normal and Pictlogica itself has been shut down but I'd love a chance to get my hands on these in whatever way possible. Even bringing them back as part of a login campaign would be lovely.