If you have you One, you might notice that MMS pictures are low res. I've created a flashable zip for anyone who wants to fix this. Please know what you're doing before flashing, you should have a custom recovery installed, understand risk, etc... XML values for size and resolution were increased, nothing else modified from the original MMS.apk.
Update: Looks like KK has a few changes in flashable zips... I'll update shortly after some more testing. Thanks for the feedback everyone.
Update 2: Fixed the flashable zip, learning process with KK for me, been a while since i made a flashable zip. New zip will update correctly, tested on my own device. Enjoy!
Thanks to @richeazy for feedback!
Update 3: Don't flash this on 30O, it doesnt work. Will try to update soon, as the code in M8 doesn't incorporate the fix yet I guess.
Update 4: added revert to flash so you can flash OTA, if you flashed this fix. Confirmed working by multiple people.