Make marketing part of your daily routine.
Be persistent.
Market yourself while you do other things: leave business cards behind you as you do your errands; stuff envelopes while you watch television.
Let former colleagues know what you're doing and that you're available for work.
Join an association and attend its regular meetings.
Attend seminars and conferences.
Contribute an article about a subject in your field to a local newspaper.
Register your name and service with an online business directory.
Join an online discussion group.
Take on a college student as a marketing intern.
Be active in your community; it'll get your name out.