A possibility for my huge entryway wall.
Collect frameless mirrors for living room wall. How to hang a vintage mirror display wall - full step-by-step via Decorator's Notebook
Johnny's flower photo gallery like this. Modern Country Style: Swedish/French Style Victorian House Tour Click through for details.
If you want to read more about (the renovations of) brownstones than you can check out these books: Restoring a House in the City: A Guide to Renovating Townhouses, Brownstones, and Row Houses wth.
Finally - A Gallery Wall For Our Stairway (Dear Lillie)