Anything from Leader Games and illustrated by Kyle Ferrin (Root, Oath, Fort…) feels like cheating but still, I absolutely adore their art style
Everdell, Photosynthesis, Parks, look nice as well
I also bought an updated edition of Costa Ruana just because of the illustrations: https://www.pamwishbow.com/client-work/project-four-yjynj-pafyx
I always enjoy the Sea, Salt, and Pepper cards and color.
Radlands visuals are phenomenal.
On the other side, the old school ugliness of Star Realms makes it intemporel. Same for War of the Ring that keep old illustrative style.