I wrote the ideas I had gotten for some of my stories on my old profile on fanfiction.net, fully intending to write them as I am right now. The ideas in question are:
Idea 1: 1st Year - The Restricted Section - Clock Chimes and Argus Filch catches...Argus Filch? (Out of Your Own Eyes)
Idea 2: 2nd Year - The Dueling Club - Snape makes Harry duel but Harry (Right Trigger/Polyjuice) is revealed to be Dumbledore. (Hogwarts Renewal Program, posted under the Fanfiction.net: Revived and Revised series, since it had been previously posted to fanfiction.net.)
Idea 3: 2nd Year - The Polyjuice Potion - Hermione is confronted by Custom Character 1 (Hermione Head with Slytherin Quidditch Body - Pet, time turner, Magic) - alternate older her from another dimension. (Hermione and Granger, Harry and Potter, not yet completed so I can post it.)
Idea 4: 2nd Year - The Slytherin Common Room - Instead of telling two Slytherin boys to go to bed, What if it was Hagrid instead? (The Effects of a Kind Act)
Idea 5: 2nd Year - Chamber of Secrets - Hagrid slaps Lockhart as he tries to runaway. (This didn't happen, but I imagine Hagrid would do it if he saw Harry and Ron chasing after him). (Clotheslined)
Idea 6: 3rd Year - Patronus Charm - Harry goes up to office to get Key, and Death Eater Goyle Sr. comes back down. (This did happen. I kept yelling at the screen "It's a Death Eater, Lupin! Attack!") (currently untitled, not yet completed for me to post.)
Idea 7:1st Year - Privet Drive - Death Eater (Any) shows up at Privet Drive. (poss. while Harry and Hagrid are shopping.) (currently untitled, not yet completed for me to post.)
Idea 8: 1st Year - Gringotts Vaults - Harry steps into vault and immediately turns into Lucius Malfoy? (Saving the Savior, also posted under the Fanfiction.net: Revived and Revised series.)
Idea 9: 3rd Year - The Shrieking Shack/The Time Turner/Freeing Sirius - 'Hermione' turns out to be McGonagall. (This is one of the inspired ones.) (currently untitled, not yet completed for me to post.)
Idea 10: 4th Year - The Third Task - 'Harry' tuns out to be Flitwick. (also an inspired one.) (Goblin Warfare, also posted under the Fanfiction.net: Revived and Revised series.)
Idea 11: 2nd Year - Borgin and Burkes - Instead of Hagrid, Madam Pomfrey. (Healing, also posted under the Fanfiction.net: Revived and Revised series.)