Here's my take, since I feel like I'm also currently in a 'dry spot'.
If I'm not happy with any of the creative ideas that I have (or if I simply have none), I'll do one of 3 things:
1) Forget songwriting for a while and go do something else..like has been said above, lots of times just setting it aside 're-starts' the creative engine.
2) Go back to some older stuff that maybe I've only half-finished, or gave up on at the time...somethings a new perspective brings old stuff to life again
3) Just go into the BIAB style library, pick something that seems different or interesting, pop in a few chords and let it rip...often, from that, you get some new idea that you can work on

I try to keep in mind that songwriting is rarely inspiration...it comes from working on and refining skills, and giving yourself some new dimensions to operate in..and, while you're doing that, often THAT is when 'inspiration' hits, and something that you really like comes out!

My 2 cents!!