Without stating the obvious, getting an actual word would be good (sky, cat, dog etc), or a name (Leo, Jay, Ash, Dan, Bob, Bill, Jill etc).
Also abbreviations can be alright (faq, fmx, hdv, etc etc), repeating letters can also be okay (aaa, bbb, ccc etc) asending letters (abc, xyz etc) NNN's can also be looked at.
Cheers
James