Go fishing. Through a line up the tree and hook your plane.
For a build to start with, how about staring at a picture of a plane you like and just go at making it? That's what I do. Part of the fun is in your own design. Process and then the other half is flying your creation.
I love scratch building. I've done a bi-plane, single wing like a p-47, a super bandit jet, a Learjet 70 jet and my last scratch build was an F-20 Tigershark jet.
Have fun exploring your creative side...