This is what we have to date in no particular order:
1. Airships GB. Full of hot air, hydrogen or helium
2. Clear your workbench GB v1. Procrastinators unite. Tomorrow.
3. Clear your workbench GB v2. Drag out the oldest occupant of the shelf of doom. Oldest started project gets extra points. I've got one I honestly can't remember when I started it
4. NMF GB. All bare metal or equivalent
5. Boring GB. Paint it grey, make it bland.
6. Liner GB. Airliners, cruise liners etc
7. 1 week GB. You only have a week to get something out
8. Berlin Brigade GB. Anything with a BB camo scheme.
9. Stare Wars GB. Anything alternative to the SW saga that makes you stare and think...that gizmo reminds me of something!
10. WW 1 GB.
11. Totally absurd GB. I.e. throw all practicality out the window and just have fun - you want 17 wings on that plane?
12. Second Korean War GB. 2018-2020 time frame.
13. Allies '46 GB.
14. The War to end all Wars GB - in other words a WW1 GB to commemorate the 100th anniversary of the WW1 Armistice
15. A revisit to the April Fools GB
16. The fear and trepidation GB - previously suggested but basically you do something you generally try to avoid (e.g. a resin kit or a vacuform or a figure or even a profile). The basic idea is to get you out of your comfort zone but with the support of others at the same time
17. The Arab-Israeli GB - to commemorate 50yrs since the Israeli declaration of independence and the kick off of the 1948 Arab-Israeli war
18. The Berlin Blockade GB - to commemorate 50 yrs since the start of the Berlin Blockade - this one might also be expanded into a more general "Transport" GB
19. Tri GB. Build includes parts from three or more scales -or- parts from three or more countries –or - parts from three or more model companies.
20. Anachronistic GB
21. Dassault GB: Any aircraft that can reasonably be assigned to an alternative Marcel Dassault manufacturer.
22. MiG GB: Any aircraft that can reasonably be assigned to an alternative Mikoyan-Guryevich manufacturer.
23. Raised lines kit GB. Down with recessed lines! Long live raised panel lines!