Here are some cones made with the directions in my Paper Cone Tutorial in use. The "tree" is just three stacked cones made with the same angle cut and different slant heights.
My favorite use so far has to be the snack stands. I made the top cones as usual and snipped off the tip. Then I lined them with waxed paper for food safety. To line them, I just cut a half circle with a radius of the same slant height as the cone it went into, rolled them to fit inside, then folded over the tip. The bases were cut using an arc I drew with the compass--about 1.5 - 2 inches away from the center point. I suggest making the snack cones and their bases fairly wide so they aren't "tippy."
I plan to give specific directions on the snack stands in a later post so stay tuned. I may also be talked into making some templates for those who don't want to figure out the math.