Jeff,
I would suggest you try some of these web locations...
Kato has some nice plans, click on "Unitrack" from
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then click on "Track Plans" down the left side under "N Unitrack". You
don't have to be using Unitrack to make these plans, they are just for
inspiration. But, if you do use Unitrack then you have the option of
taking apart and redesigning your layout as often as you want.
A Google search for "N Gauge model train layout plans" should yield
some interesting links or download some track planning software and
design your own layout - check out
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it has design
software (for Windows) and it's pretty good bang for the buck.
If this doesn't yield some possibilities then check out what the local
hobby shop, library or club has in the way of magazines and
publications.
Pete