How about a model of a near-future hard sci-fi starship / mothership / colonyship for Orbiter (love and hate it the same way as FL but for other reasons)?
I am working on star system generator to populate yet unknown worlds with all the vast types of planets and space bodies. And that all is to be explored.
All it takes is a 3D model and texture, optionally, with a normal map. Rest I could do myself.
But the challenge is to make it a serious looking vessel.