I think this Big Babol XXL Bubble Gum advertising is a great and bubbly idea to catch attention. I just wonder if the bubblegum is sticky.
How funny would it be to walk into just a regular bathroom (or so you think) and as you close the door a pop up comes out! lol [Ambi Pur Supersize Popup (Media) by Jacques Pense, via Behance]
IKEA Direct Mail - pop up style. Great direct mail item that is a form of novelty advertising which will surely resonate and be effective at keeping and retaining the receivers' attention.
You could make a similar 'color wheel' with wall paint, using cans, or something easily paintable and less breakable
Adidas shoebox pop up
advertisement on newspapers is usually expensive and for small ads that young professionals would want to post can come at a great cost, hence why social media seems to be the easiest and cheapest methods