"Marshmallow World" may be the greatest Christmas song of all time!  Right up there with "Mele Kalikimaka"

So here's the thing... I don't display them.  Not because I don't love getting personalized mail that doesn't demand payment or something equally disappointing, but rather due to the fact that my Holiday Cards remain in the box, unsigned, un-addressed and likely to there to remain until next year's purge.

 
That said.  I've always wanted to get a huge lovely ribbon and hang it with some fabulous bow  to display these cards on the wall.  I'd likely staple them on from the inside and hang them vertically so that they still open.  Fantastic!

There's also, making your own holiday card holder thingie.  The old foam core wrapped in fabric (or wrapping paper), criss-crossed in festive ribbon with buttons at the x's for strength.  Tuck cards between.  That would be nice also, I think.

Well, I have a two story home so I have a large wrap around bannister that I hang a garland on.  Instead of using bulbs to decorate along with my lights I use a hole punch in the upper left hand corner and use a piece of red or green ribborn to tie it to the garland.  It is pretty, practical and I notice people pause along the stairs to read them. 

If you don't have stairs you might try hanging a garland around your front door, and interrior arch way or along a sofa table and using the same concept. 

this looks pretty cool......

though i think i may try making one myself.  ooh! new project idea!