Seeing as how Spire came out of hiding with some great covers, I felt maybe I should do the same. 
Sometime around when the project was still in the old thread, I started working on a SVG (Scalable Vector Graphics) version of the Sonic and Knuckles logo in Inkscape.  I was just bored I guess...  but seeing as how I think it looks better then the version that Spire is using, I thought I'd see if it would be of any use to anyone who wishes to use it. 
I have three version, all exported to large PNGs. 
One with a black background. 
 
One with just the halo. 
 
And no halo! 
 
yay!  I'm a contributor!