Jo,
Typically you will see the multiglode standards with the largest globe on the bottom to the smallest on top. You can train the ivy around your trunk(the stick you are using) a tight twist with the leaves removed will cover and obscure the trunk. If you want a fast result stuff the forms with green moss (sphangnum). This will give you a very nice effect even with a sparse cover by your ivy. Also by soaking the suffed globes in water for about 20 minutes they will puff up quite nicely. The moss acts as a structure for the ivy to root into . I am presently working on a plan for building the globes with poultry wire and if you would like I can forward you a copy when it is ready. I've completed the prototype and I'm presently completing the instruction sheets. Just send me an email if you are interested, and welcome to topiary hope you enjoy yourself.