I have bought some old wooden ironing boards at the thrift shop to use as buffet tables for parties in the yard. I add a table cloth and line the boards along the deck or along the edge of the flower bed. They look really nice. One is for food, and one for plates cups (etc.).
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Use an ironing board as a side table for a sick person or a table to wrap gifts.
If you have an old ironing board that is made from metal and is not usable for ironing, turn it into a fish cleaning station by fastening a fish board onto the wide part.