Not all bees like to live in hives. The loners don't sting and they don't produce honey, but they are pollinators. Offer them a roof over their tiny heads:
Above: A set of three Mini Solitary Bee Houses, made of oak with steel roofs, are $34.95 from Williams-Sonoma Agrarian.
Above: Mount the bee houses on a wall, fence post, or tree. Each house measures 4 inches long by 1.5 inches wide by 1.5 inches high.
For more about how to attract pollinators, see "For the Bees: Gardens With Pollinating Plants."