Never mind the details. Don't waste your time with elaborate props. Get your characters on the page and have them interact. Actions do speak louder than words in visual media. And actions and reactions were divinely primed for use specifically in comics.
My friend Casey McBride and I tried all sorts of variations on Fill-in-the-blanks collaborations. Comic creators call this Comic Jamming. Late nights helped keep the process interesting. Casey is a trained animator and I am a trained as an illustrator. This activity always kept us entertained.You can see what he does by following this link: McBrideCasey.com.
Try this at home when you are stumped for an idea. Take 2 characters and put them side by side in 4 panels. Put different expressions on their faces and then go back and try to put words in the bubbles that make sense with the random expressions you chose. Then try it with another friend and pass it off to them to try. After that add as many people as you can. You will be surprised at the variety of original ideas you come up with.
Let me know what you come up with and I may link it to my blog.