Hi scottguy! I actually teach songwriting so I hope that you will find my suggestions helpful.
1) The first thing I tell my students is: Don't force inspiration. Meaning, do not sit down at your desk, with a pen and paper, or laptop, or tablet, etc. and force yourself to write something. Inspiration will find you and in turn will inspire you to write.
2) Keep a writing pad or journal with you. Or these days, a tablet or the like. Take it you with you where ever you go. Jot down anything that catches your attention or that you find interesting. These things may be separate ideas from each other but at some point these may suddenly fall together to create one grand idea. Think of it as a puzzle, go out into the world and search for individual pieces and slowly put those pieces together.
3) Another approach is using post it notes. It's the same concept as the journal but post it notes instead. What's different about this is that you can post them on a poster board or wall or where ever you want to stick them. Move the pieces around until you find something you like. I like to stick my post it notes on the all above my piano.
4) You can also try webbing. Take a sheet of paper and right in middle write a topic that you'd like to write about. For example, let's say you decided that you want to write about coffee. Write coffee in the middle of the paper and around it write down the first things that come to mind when you think of coffee. So when I think of coffee, I think Starbucks, warm, cigarettes, etc. Then I write down the first things that come to mind about those things. Starbucks for example, I think of friends or the cute barista making my coffee.
Hope this helps!