Welcome!
When I first saw Apex's MM-styled SF sprites (over at Gootecks.com's Forums), I immediately made one of El Fuerte who is my main and most favorite character in SF4. I then proceeded to make a few more and before you know it I was hooked and on a mission to make all the fighters in SF4.
As of today, I have designed Mega Man-inspired Super Street Fighter 4 sprites for ALL the characters in the game, check them out below!
NEW SUPER Street Fighter 4 Sprites!
Yang

Yun

Hakan

Ibuki, Makoto & Dudley

Adon, Guy & Cody

Juri, T. Hawk & Dee Jay

All 35 Super SF4 characters from A-Z are presented below:
Row 1: Abel, Adon, Akuma, Balrog, Bison, Blanka, Cammy
Row 2: Chun-Li, Cody, C. Viper, Dan, Dee Jay, Dhalsim, Dudley
Row 3: E. Honda, El Fuerte, Fei Long, Gen, Gouken, Guile, Guy
Row 4: Hakan, Ibuki, Juri, Ken, Makoto, Rose, Rufus
Row 5: Ryu, Sagat, Sakura, Seth, T. Hawk, Vega, Zangief

For individual sprites, please visit my thread at SRK Forums.
I've also created a wallpaper in various resolutions for different platforms:
Desktop Wallpaper
Wallpaper #1
1024x768
1280x800
1680x1050
Dark Versions of #1:
1024x768
1280x800
1680x1050
Wallpaper #2
1280x800
1680x1050
Mobile Wallpaper
Palm Pre (320x480) *UPDATED*
Palm Pre Pink Version (320x480)
Palm Pre Dark Version (320x480)
iPhone (320x480) *UPDATED*
iPhone Pink Version (320x480)
iPhone Dark Version (320x480)
Android G1 (640x480)
Android G1 Pink Version (640x480)
Android G1 Dark Version (640x480)
PSP Wallpaper
Original (480x272)
Dark Version (480x272)
I will be tweaking/improving these sprites over the next week as well as brainstorming some more wallpaper ideas!
So stay tuned and/or follow me on Twitter.com/SpeedBrkr for the latest updates!
By the way, if you see any of my sprites around the net without due credit to me, please let me know and thank you!
Check out all my Mega Man-inspired (Super) Street Fighter 4 Sprites (as seen in my Avatar)!
http://www.capcom-unity.com/street_fighter/go/thread/view/7411/20179857/Mega_ManInspired_Street_Fighter_4_Sprites