adni18 - If your point is that the inspiration for MS' wallpaper could have come from seeing yours, that's real different than "have took my "XP Wallpaper" and they change it with slightest modifications, to monochrome blue, without any notice or permission."
My feeling, like paxx, is that it's a coincidence. If you believe they were inspired by seeing yours then I can see where you'd be proud that they were affected by your work.
As far as it being a rip, it's not even as close as the famous George Harrison "he's so fine" and "my sweet lord" dispute which I also didn't agree with.
btw - your english is fine, and I didn't think you started a flame thread... I was just hoping it wouldn't go there