Here are some of my mini-ideas:
-A descendant of Koine Greek spoken on the edges of the Caucasus. It has evolved ejectives, nasalized vowels, labialized consonants, and a 2-vowel system. It is also split-ergative and is heavily agglutinating.
-An experimental "alien" conlang with immovable word order(no transformations) and a very specific class of words which encode both the subject and the object.
-A Mandarin-Tlingit creole.
-A European isolate spoken in Spain. It shares some features with Basque (laminal-apical contrast, Ergativity), and Proto-Basque(no m). It however, is most influenced by Semitic thanks to Phoenician colonists who picked up the language, and even has partially developed triconsonantal roots.