Alright try this Triangle Powers PPC-6800 Hacks. It will change font's in a few places other than this I don't know. It can do more things than just that also. Like disable "sent sms", Change text colors, Improve vibration strength, Camera save orientation, Improve A2DP quality, Disable leds, Change scroll bar thickness...
Heres tip. Once you install this and make the changes you want you can remove the App from your phone and the changes will stick.
Link to their website is
HERE but they've been closed for a while.
Pages 3 and 4. Color changes you can make:
Tap and hold color
Start menu txt color
Today screen txt color
Today screen bar color
Start txt color