One of our favorite places to get ideas is Houzz.com.

At last count they have 4,403,778 photos of home interiors and exteriors to inspire.

Among other things, they have photo examples of rooms made bigger - like this one with boxes on the wall.
 

StyleCaster's 25 Tips

A lot of methods for making rooms look bigger - many you may have never heard of.

Of course, it offers lots of other design ideas, photos, and detailed ideas.

Colors That Make Rooms Look Larger than Life

House Beautiful has color ideas to make rooms look larger.

It never occurred to us that blue would make a room look larger? Not to mention many other colors that came up with...