Why not try to wrinte an advance tutorial, simple tutorials like setting op directX, OpenGL, creating triangles etc. you can google for it!

:arrow: I would like to see a tutorial about lightmapping (dynamic and static in 1 tutorial)
:arrow: Creating a simple UI (buttons, edit boxes). (like K4Zwrote)
:arrow: How to store game data (Images,Saved games,etc) in 1 big file.