Keeping it simple with a small build, the Little Red Compact Roadster (LRCR)
Based on the small Fiat sports cars of my youth. I wanted to keep this simple, with a small brick count and what I envisioned a cheap entry level style kit. The build is approximately 45 pieces counting the mini-fig and is a easy assembly.
It isn't the biggest idea, but not all ideas need to be $100's, this one is aimed directly at the entry level Lego budget buyer.