AQA Computer science NEA project ideas

I need an idea for my non exam assessment project but I can't think of any. What have you guys done or do you have any ideas?

Here are some of the programs from my class:
- Chess Program (One Player + Two Player)
- Poker (Including betting, user accounts, multiple rule sets and player vs computer)
- Civilisation (the game) simulation
- Games made in unity 3D
- Internet Of Things using Raspberry PI
- DJ Software, for mixing music

How complex is yours/others in your class projects? Are any of them crazy? xD

Also how many pages have you done/ lines of code?

Mine is more complex than others, but one or two are really ambitious. I have done ~3000 lines of code which is about 30ish pages in Microsoft Word

How many pages all together? (Analysis,Design,Implementation,Eval,Test)

How many pages all together? (Analysis,Design,Implementation,Eval,Test)

People have done over 200 pages in my class lol