I didn't mean to discourage you. If you give me a PNG file with transparency, I can reformat it to work without losing anything.
On a side note, realize that your penguin logo basically will look painted on the crystal, rather than looking embossed into it. If this is what you want, then don't mind me.
Generally I have tried to create logos that are outlines so that they can be made to look
carved. This definitely creates limitations.