I've only made two bouquets, both with full size cupcakes. I got my pots at the 99 cent store and used a plastic wrapped cabbage instead of the expensive styrofoam balls. I got the pot, walked over to the cabbages, poked the cabbage in the pot, and if it fit, I bought them both.
The cabbage provides the weight in the pot, and only half sticks out above the pot's top edge. The toothpicks stay really well in the cabbage. I wrapped the cabbage as-is in green tissue paper & jammed it down into the pot. I used two toothpicks for each cupcake and cut little triangles of green tissue paper and poked between each cupcake.
I did have some of the wrappers start to detach from the cakes, but I just pushed in more green tissue paper. I didn't know how to use the 1M tip then (newbie), so next time I'll frost the cupcakes AFTER I poke them onto the toothpicks. You still have to be careful because it is top-heavy.