That's really a broad question there - not knowing what you would like to actually hang it is hard to suggest something.
I'd suggest picking out some blocks that appeal to you and make a few blocks and border them out and bam you have a wall hanging. Since it is a smaller project than a quilt you can really push yourself and pick out some intricate ones.
I have a list of free tutorials/patterns for wall hanging links on my personal site. Maybe one will help you narrow it down?
http://yarn-or-fabric.weebly.com/qui...-hangings.html
Don't forget about the holidays... the fall always gets backed up and you might not have time to make anything seasonal ;)