For an example, here are the grass theme's ones:
No new posts
New posts
New posts in/as well as a subforum
Here are the 3 the dark theme uses:
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The last 2 are the same because I was lazy =p
You can get the background colour from those images above (they only look transparent because the colour is the same as the background colour for this post, that is, if you're reading this on the dark theme). You could make transparent icons but only if you use .gif, no transparent PNGs since IE6 is rubbish and doesn't support them and the default theme really should be 100% IE compatible >_>
Prize is, well, you get your icons used
GO