I was referring to people asking for loans using IDs but trying to use some random things (a car, apartment in a foreign country, stocks, etc) that cannot possibly be claimed, as collateral. I have no advice on what can be used for collateral though. Loans are not an easy business.
You could use stocks if they are BitFunder or BTCT stocks. Transfer the shares between the accounts, when the loan is repayed transfer them back. Although, this sort of thing is more like pawning than usual lending collateral.
That's true, I'm not sure of those stocks are legitimate sources for a loan though. Even the legally registered Bittalk Media shares (I hold 23.5%) were going to be used for a loan to pay some business debts after my fall out last year, but a malicious board member formed a hostile takeover and blocked sales of shares while attempting to remove shares from me through shady ways. That has forever changed my opinion of the real value of shares in anything. As a side note, people buying shares of fly by nights on the forums always amazed me.