"One of the most frustrating things is to go to a home and they keep you for two hours asking your opinion on things like place-setting colors and place mats," Hardgrave says. "It gets sticky. You want to be fair and reasonable and not lose the client, but time is money, too."
I personally think that it's a very bad idea. I have been caught too many times with my pants down in the past of where I offered free designs, and the customer took those designs and either 1) did the work themselves or 2) had another company do it.