Usually it helps if the other team is interested in your picks as well. Even if you don't include any of your picks in the deal, it suggests they are interested in trades involving picks so if you put a fair deal on the table there's a good chance you'll get them to accept.
Its only worked for me on one occasion. I traded Stromile Swift Ovrl: 80 to Charlotte whos want rating was %100 for top 5 draft pick and they accepted.