I'm looking for a job, but my resume is pretty scarce. I'm starting to think that's why I haven't been getting any interviews at all. Usually I'm too nervous to lie, but I have no real choice right now, so I'm trying to think about any obvious holes that might end up in my story.
Be realistic with what you can get away with. Anything really outstanding or impressive, or something that your whole resume hinges on, might get extra scrutiny. Anything that confers a skill that you might be able to teach yourself in detail is good, because it gives you the ability to "prove" that it is true.