Third file: Mms.apk...stock look MMS.apk
Second file: mmsmod.zip...same as third, but in a flashable zip
First file: custommmsmod.zip... Customozable Mms.apk with bubble style & color options, in a flashable zip. For odexed Roms unzip the file and extract the MMS.apk, then follow the instructions below.
This is for the people like myself who want all the new features of the custom ROM messaging app but without being overly themed. What you get is a clean stock look with the IOS type emojis (I hate those new green/black ones) w/ the quick emoji button, option for quick reply / popup, and change vibrate pattern option. I didn't build this, I extracted it from an old version of xylon ROM a while back, so credit goes to them. To install, simply use the root file browser of your choice to place the MMS.apk into system/app folder and set permissions to rw/r/r (if your not sure, long press any other apk in system/app folder and look at what boxes are checked, then do the same... should look like a backward 7), then reboot. If you are on stock odexed ROM you have to rename the Mms.odex file to Mms.odex.bak. I'd suggest doing a backup first or at least rename your original MMS.apk to MMS.apk.back so you can easily go back if something is wrong, but it should work fine. I've tested it on stock odexed ROM, everything works great including MMS. enjoy
Update: I have included flashable zips for DEODEX only. First one is the same (stock look, iOS emojis, popup), the second one is the newer fully customizable MMS.apk. its black but can be themed any color you like and even has bubble options, the customization possibilities are endless give it a shot. It was pulled from baked ROM so credit goes to them
Update (5-3): replaced stock look MMS.apk with a new one extracted from slim ROM (credit due to slim Dev team). Basically the same as before with stock look but includes some nice new features: adjustable font size, "breathing"SMS icon on status bar, larger MMS preview pic, pushing "read" from lock screen no longer unlocks phone, privacy mode, pick up to call from SMS (awesome), easy select for multiple recipeints, and more I can't remember right now.
Update (8/9): Added mmsmod4.3.zip, basically its the original mmsmod rebased on the Mms.apk file in 4.3, extracted from PSX rom (Thanks to ragnarokx for putting this together and the devs of PSX rom for the source of the .apk)