The one I'm currently working on, Spirit Quest, is Arabian Nights themed in 16-bit. It will have more of a focus on Spells and visual puzzles. It will also feature Day and Night cycles. It's rather ambitious so it'll be a while before it's done.
I hope you can also make a "MacVenture" style game in the format of "Shadowgate" "Uninvited" "Deja Vu" & "Infested" that takes place in Egypt. Also 1 that takes place in either Antarctica or Alaska. Plus 1 that takes place in Japan.