I wrote about fun photography, but what about deliberately breaking the rules in your serious photography - normally shoot landscapes sharp from front to back - how about trying wide apertures and a small plane of focus for a change. Normally wait for the wind to die to get your shot, how about deliberately shooting in the gusts to record a living moving landscape?
If your norm is a full tonal range from black to white, maybe try some highly compressed tonal images, you never know, you might like it.
Odds are you won't get anything great, but if you are honest with yourself, you are lucky to get one good image in a hundred shots anyway, so just how much worse could this be?
See how many rules you can come up with that you might try breaking and let us know what it/they are through adding a comment.