Your foyer or entryway is the 'cover' to the book that is your home. Make it warm and inviting. Generally, this is where you receive guests and it's also where you say your good-byes. So your foyer gives your guest their first, but also their lasting impression of your home. You should make it warm, inviting and cozy.
Color is one of the most important ways to create warmth.
Once you've decided on a color theme, use it like thread that runs throughout your home. Your foyer is the 'book cover' of your home. It makes a first, and a lasting impression.