Yesterday I took a class with Motown songwriter, Clay Drayton, and he offered up a great tip for coming up with song titles.
Next time you're in a conversation with someone, listen carefully to what they're saying. Don't just listen, but listen for titles. He had us do an exercise where we would speak to the person next to us for 2 minutes, while that person listened and wrote a list of all the titles they heard from the first person's conversation.
You'd be amazed by how many song ideas you can get from that. And once you have a title, you have a central focus for your chorus, which will get you going for your whole song as well... cool stuff. If you incorporate it into your every day life, you'll be flowing with ideas...