Many nice ideas here. With our sign opportunities, cabinet builders, and lumber yards we use photos & marketing fliers with a clooection of previous work, materials, and cutting styles. Samples are definately nice especially if free but I haven't found them to be of any help in getting orders that sales calls and photos didn't suffice. The one material I would recommend is Color Core for a quick "cut and ship" material requiring no special finishing or paint with proper bits. Check the post under "sign making" on Color Core survey for web site and details.
I usually carry samples for show & tell but rarely leave any free work behind. A Picture of is worth a thousand word. Our experience has been that IF they need something it is special anyway and they still call when something comes up.
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