I have several ideas that were probably done by others, but not in the way I want. Thus, I'll try to do them myself.

My fanfic plans are as follows:

Update: I am quitting ASOIAF! Eleven Heads will be discontinued. You can adapt the story if you want.

Arranged Marriage: Acnologia is defeated and Zeref recovers and returns to Albareth while promising never to set foot on Ishgar. King Toma negotiates a peace with Zeref and arrange Zeref and Hisui to be married. Albareth and Fiore signs a peace treaty and became allies. Mavis becomes the master of Fairy Tail once again. All other ships sails and all live hapily ever after.

Geass Wars: Unlike the other two, this would be centered in the Code Geass universe in which Lelouch becomes fully evil after defeating Schneizel, and successfully killing all those prisoners of war in Episode 25 R2. Lelouch received the code and is immortal. The fic would focus on the hero that would lead the rebellion to free the world from the reign of the Evil Emperor Lelouch, 30 years after the events of Episode 25 R2.

Uchiha Clan Survival: What if the Uchiha Clan is stronger(more of its members have awakened the Mangekyo Sharingan,) and survives the massacre? Unlike most fanfics, there would be no pairings with Sakura to any Uchihas.