I would have made it the same color as the forumfall background if I could.
Save the image with transparency, or change around the file extension so that you're not asked this prompt when creating it with gimp.
.gif works (but it'll ask if you want to grayscale it)
When it's transparent it'll automatically take up the color of whatever background is behind it (because it's transparent).
You'll have to re-add your font and do a different color shadow drop for this, otherwise you'd have floating white in the background for the shadow.
If you tell me where you found your fonts, I could do this for you. Although it's kind of an easy thing to do.