I have many idea in my mind. I were hard time make a choice one project, I will tell to you about my ideas project.
1. TDM and DM message popup (similar RTB popup).
2. Mail GUI system.
3. Health bar (text) at above player's head.
4. Poll/Vote GUI system.
5. Brick spawn shape of round, triangle, octagon, hexagon, diamond, star, pentagon- size 4x4. - %10
6. Wedge/round windows.
7. Brick skateboard park packages.
8. Brick sideways arch.
9. Quest GUI system (not event_quest).
10. Story mode GUI
11. Adventure mode GUI
12. Agreement Rules. -%100 finish
13. hard hat with the light for gamemode mining.
That it for now. I will continue think then add it in my list at here. Above list are pretty hard for me to create these of my own project mod. Anyone are welcome for help with this projects. I am not going give you a details of above list. Feel free ask me some of your question, I will be happy answer to you.