What are the best colors for yard sale signs? Well, you have only seconds to attract a neighborhood driver who is looking for a great garage sale or yard sale. A successful yard sale sign will use bright colors and be highly visible to drivers traveling up and down the street. In deciding on the best colors for yard sale signs and garage sale signs, you can take a lesson from the most common street signs. Stop signs, directional signs and warning signs are made to attract attention. Sweet Yard Sale signs use those basic colors but we also use other colors for those who still want a little cuteness in their sign. But we ALWAYS put effectiveness before cuteness. But be sure to add lots of cute items to your garage sale or yard sale.