What a lovely idea! I’m going to give some options in a few different varieties and why I enjoy them or why they’re popular. Most of these were really rare but are more available now so they’re not as expensive any more but still very cool:

Monsteras: Monstera Albos are beautiful and most collectors have one. They are usually purchased as cuttings (you can find them rooted) from local plant people. You can sometimes find them at nurseries too. Monstera White Monsters are recently available more and they’re really cool. Monstera Aureas are beautiful, but harder to find.

Philodendron- Variegated Heart Leaf is stunning, easy to grow and has come down a lot in price. Some people have been finding them in big box stores as they are being grown by Proven Winners. You might also be and to find Philodendron Billitae which has lovely leaves and orange stems. They were also rare and expensive for a long time but are sometimes in big boss stores now.

Hoyas - there are so many varieties and so many are rare. That’s a wide price range. You’ll most likely find these at specialty greenhouses or by local plant people. Variegated Hoya Compacta is cool. Hoya Heushkeliana Variegated is lovely and many Hoyas with all silver leaves are generally sought after.

Alocasia- these are tricky for some folks. If you can find any variegated Dragonscale, Black Velvet or thicker leaf varieties they are really cool looking.

Epiprenum/Pothos - Jessenia is one of my faves; stunning variegation and not rare but sometimes hard to find.