The only thing that comes to mind at the moment are lantanas. There are many types. You will need to consult the nearby nurseries and perhaps the local plant club.

Beach sunflowers(Helianthus debilis), railroad vine(Ipomoea pes-caprae)...?

Thanks, I'll try the Lantana. I do like beach sunflowers, but mine died out. I planted some railroad vines on my property along the public sidewalk but the county keeps mowing them down :(

I second the beach sunflower recommendation. I got a cutting and have them everywhere now. They are even growing up my fence and look so pretty.

Beach sunflowers are no so "plant and forget". They have a life span. After a couple of years they start dying out. That is when you get out there and pull all those large plants out. After that you don't have to do anything. The seeds will create your next spread of BSF. GL

Mine didn't come back. I think I have too much shade now.