A new set of 2, a blue print and a new house plan, found under Decor / Wall Decorations, both costs 1. Ideal decoration items for the architect's office. The colour/contrast of both prints vary a lot depending on the surrounding lights.
Blue print and new house plan set 1 (MediaFire)
Architect office 3. Blue print and new house plan
Architect office 2. Blue print and new house plan