It's great to have a space for displaying the cards and lovely to have a bit of colour and decoration on the bare wall. I do have lots of "proper" pictures waiting to be hung up, but still haven't decided where to hang them (I know, I know). It's nice to have something up on the wall in the meantime.
(I've been watching a lot of cheesy Christmas movies while sewing lately!).
I've also got lots of postcards from my Nice Days Out stuck up on my bookshelves and my pinboard is full of pretty things that never fail to cheer me up when I look up from my desk.