I have seen several things made from motherboard over the years from clocks to coasters and none of them have been particularly useful to me. Motherboard Gifts & More has a cool computer themed business card holder that I could use.
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The outside cover of the card holder has a chunk of a motherboard on it from a real computer. The case measures 2 ¼” x 3 5/8” and is sized to hold 10-15 normal business cards.
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You can also get the inner lid engraved for an additional $6 over the normal $24.99 cost of the card holder. Available colors are red, blue, and green and are subject to availability. Via Motherboard Gifts & More