There are lots of white flowering things, but color - lasting color - is harder to come by. I'd look into Green and Gold (Chrysogonum virginianum) and Mouse eared coreopsis (Coreopsis 'Nana) first. By the way, my Home Depot north of Atlanta is stocking both of these as pint sized perennials right now. There is also Iris cristata (tiny iris, so cute!), Monkshood (Aconitum species), Phlox divaricata (cultivars often available), Campanula divaricata (bellflower), Bellworts (Uvularia), solomon seals (true and false). Hope that gets you started.

Can't help with local recommendations. But if you're not after gallon size or larger, I've been happy with other qt size natives received from Lazy S'S Farm Nursery (lazyssfarm.com) out of Charlottesville, VA. Noticed they have both the plants you are looking for. Here is a link that might be useful: Lazy S's Farm Nursery on-line store

They don't have a website, but this company in McMinnville, TN will send a paper catalog upon request. Name, mailing address & phone # is on the link below. I believe they have all of the plants you mentioned and more. All plants are shipped bareroot, but I have never had a problem establishing them. Rb Here is a link that might be useful: Dave's GardenWatchDog

I think you need something a bit bulkier. A multi light pendant might be pretty. https://www.potterybarn.com/products/clift-seeded-glass-3-light-cluster-pendant/?catalogId=84&sku=2154081&cm_ven=PLA&cm_cat=Google&cm_pla=Lighting%20%3E%20Pendants&kwid=productads-adid^202405455838-device^c-plaid^295396197027-sku^2154081-adType^PLA&gclid=CjwKCAiA_c7UBRAjEiwApCZi8eDhOL9ULmRxHn2JhU0vQC2k9_PABRJq1jjzE5puywsZT9UuJO-0AhoChJwQAvD_BwE&cm_ite=[[PLA]%20-%20Good%20Desktop] As for barstools, something like this that provides some contrast against your island would be nice. https://www.jossandmain.com/furniture/pdp/east-village-24-nail-bar-stool-lopk3029.html