The idea I would think of his to throw him an airplane party. Rent a room somewhere that is quiet and only family and friends would be allowed in. Decorate it with homemade paper shaped planes, or models, toys, etc. But make everything planes.
For my sons first birthday party I threw him a green colored party because his favorite color has been green since he was born. I bought a personal size cake for him with green frosting and used green cake gel to write his name on it. I made 2 bundt cakes half white half chocolate and used frosting on one and whipped cool whip on the other and dyed the white cake and frostings green. I bought party hats and painted them green and decorated them with lighter green colors. Green balloons; well you get the picture.
The only thinks that weren't really green was the table clothes, regular food, and streamer. I made the streamers from construction paper. I had also bought a white tablecloth and wrote happy first bday and had everyone that came write messages to the birthday boy. He can keep that forever. Also on the table cloth I used stencils and drew things that would be green. Like frogs, lizards, turtles, snakes. Turned out really well.