Micheal Murray's Between the Lines is an excellent example of the power of verbal suggestion - ask a few questions of a scene created in a spectator's head and you produce a page of a second hand book that matches it near perfectly. Maybe you could go down that route?
Or, if having them imagine a painting that then happens to be your 'latest addition to the gallery' isn't your thing maybe work it backwards? Like after a few effects such as a predicted card choice, drawing duplication and a predicted colour/shape/word effect you draw eyes to the painting that features all of the chosen items as motifs. And if you don't want that I'm having it!
Your post made me thougth about John Thompsons Naked Mentalism, this book is a toolbox which could help you build your routine.
Google it, it's only availiable from his website I think.