Ok...here is a little bit of what I've been doing....I am putting the hummingbird when finished on a cement bench that my mom has and the little spikey ball is just weird..so I liked it. I saw a picture of something like this that the gal had used roofing nails and a bowling ball, I figured that was just a little to hazardous to my health so I used a small (a little bigger than a quarter) styrofoam ball and little tack nails...