Okay, so I finally got around to doing a tutorial, woo hoo! Sorry for the picture quality, it was a rainy and dark day.
I typically trace/draw a picture on parchment paper and then use this as my guide to cut out cheese, sweet potato, tortillas, or whatever else is easily cut into shapes.
Once the jeep bodies have been cut out I use a pastry tip (straws the like work just as well) to cut out circles for the tires and headlights. In this case I have used fruit leather for tires (olives work as well for more savory sandwiches) and cheese for headlights.
I then "glue" the finished jeep to the sandwich. You can use honey, jam, sun butter, peanut butter, anything that is edible and sticky!
For the alligator carrot, I slice the carrot thin and then cut the top at an angle for the head. I then cut a zig zag design in the snout to make his mouth. Lastly I cut a bunch of small zigzags down his back. You can also add feet as I have done here.

Here is the finished product. Another camp day bento safari style.
contents: baby banana, zucchini bread elephants, veggie booty, corn, cheese giraffe, alligator carrot, watermelon, blueberries, sunbutter and jam sandwich with spinach tortilla jeep
I used some mini cookie cutters for the giraffe cheese and the elephant.