I have a lender where I need a total of three more tradelines from my borrower.

In similar circumstances, what have you all used as alternative forms of credit for tradeline conversion?

Phone, utility, insurance, rental history, cable, all come to mind.

I've used tradelines as off the wall as storage facilities, children's day care and private school tuition.   

Those rent-to-own places with the weekly payments are possible sources, too.  Although, I would not pay $1500 for a $300 TV myself.