yes it is transparent, but it's a fresh cut edges aren't smooth. I only have paint.net at the moment, but someone with more advanced photoshopping skills could turn this into a nice thing.
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alright, here are my feeble attempts on doing some ground logos. The forum uploader is converting them into .jpg-s but the original file is png. (And yes they're all with transparent background). i'm putting them in a .zip file so everyone can try it out and/or change it.

download link
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some screenshots