How can you claim to copyright another persons design? No matter how you look at it, essentially, every icon design at DA using those symbols is a rip of the icons that come with Macromedia's software...a design that another artist or graphic designer created. There's nothing really original about them. Yours are only a variation. How would you think he/she feels about you proclaiming his/her inherent design as your copyright?
They're nicely done and I'm not trying to flame, I'm just making a point. Hey, I may even use them myself!