The ones I've been into, the ones I didn't.

• A Camel
• ✔ A Horse
• ✔ Airplane
• Ambulance (not looking foward to accomplish this one...[2])
• An Elephant
• ✔ Bike
• ✔ Bus
• ✔ Cab
• ✔ Cable Car
• ✔ Car
• ✔ Carriage
• Cruiser
• ✔ Ferryboat
• Fire engine
• ✔ Fishing Boat
• Helicopter
• Hot Air Balloon
• Jet Ski
• Monster Truck
• ✔ Motorcycle
• Nuclear Submarine (?)(...Still free.)
• ✔ Paddle boat/Pedalo
• Police Car (not looking foward to accomplish this one...)
• Rocket (Dreaming is free. Ok? Ok.)
• ✔ Scooter
• ✔ Skateboard
• Spacecraft (Again, one is allowed to dream.)
• Submarine
• ✔ Subway Train
• ✔ Tractor
• ✔ Train
• Tricycle
• Truck
• ✔ Twins bike
• Unicycle
• ✔ Van
• Zeppelin