[Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A] CoffeeCone:
I added some custom icons to the default icon pack in the HaSa MIUI v3.1.25 [ALL MDPI] rom found on this thread:

http://xdaforums.com/showthread.php?t=1828637

Basically, what I did was make their icon fit more into the MIUI look and feel (square and rounded edge). I only made these icons for the apps that I think don't look good with the default MIUI launcher's auto-adding of background colored square icons. This still has the icons that are contained on the default one provided by the ROM. I just added mine to the mix.

Here's the list of the added icons to the pack:

acr.browser.barebones (Lightning Browser)
alexcrusher.just6weeks.full (Just 6 Weeks)
cm.aptoide.pt (Aptoide)
com.adam.aslfms (Simple Last.fm Scrobbler)
com.adobe.flashplayer (Flash Player)
com.adobe.flashplayer.SettingsManager (Flash Player Settings)
com.alensw.PicFolder (QuickPic)
com.alexisblaze.japanese_grammar (Learning Japanese)
com.amazon.venezia (Amazon Appstore)
com.androidemu.gba (GameBoid)
com.androidemu.gbc (GBCoid)
com.androidemu.nes (NESoid)
com.androidemu.snes (SNESoid)
com.andrwq.recorder (Smart Voice Recorder)
com.anydo (Any.DO)
com.bittorrent.sync (BitTorrent Sync)
com.box.android (Box.net)
com.breakapps.breakdotcom (Break.com)
com.buak.Link2SD (Link2SD)
com.chikka.gero (Chikka)
com.cleanmaster.mguard (Clean Master)
com.dmitril.droidoverwifi (Droid Over Wifi)
com.dotgears.flappybird (Flappy Bird)
com.droidbender.animania (Animania)
com.droidbender.mangania (Mangania)
com.evernote (Evernote)
com.facebook.katana (Facebook)
com.facebook.orca (Facebook Messenger)
com.flyersoft.moonreaderp (Moon+ Reader Pro)
com.fronde.mbanking.android.pckg.bpi (Bank of the Philippine Islands)
com.g.pocketmal (Pocket MAL)
com.google.android.apps.plus (Google+)
com.google.android.apps.translate (Google Translate)
com.google.android.gm (GMail)
com.google.android.youtube (YouTube)
com.google.zxing.client.android (Barcode Scanner)
com.ideashower.readitlater.pro (Pocket)
com.idisplay.virtualscreen (iDisplay)
com.ijinshan.kbatterydoctor_en (Battery Doctor)
com.IMStudio.PocketRally (Pocket Rally)
com.keramidas.TitaniumBackup (Titanium Backup)
com.koushikdutta.backup (Helium)
com.lavalevel.questlord (Quest Lord)
com.linecorp.LGRGS (LINE Rangers)
com.mhuang.overclocking (SetCPU)
com.miniclip.eightballpool (8 Ball Pool)
com.mojang.minecraftpe (Minecraft Pocket Edition)
com.ms.screencast (Screencast)
com.ms.screencastfree (Screencast Free)
com.mxtech.videoplayer.ad (MX Player)
com.negusoft.ugamepad (Ultimate Gamepad)
com.nitrome.touchy (Nitrome Touchy)
com.nolanlawson.pokedex (Pokedroid)
com.oasisfeng.greenify (Greenify)
com.playalterego.android (Alter Ego)
com.portablepixels.hatchi (Hatchi)
com.pushbullet.android (Pushbullet)
com.quoord.tapatalkpro.activity (Tapatalk)
com.sand.airdroid (AirDroid)
com.sonyericsson.android.camera3d (Sony 3D Camera)
com.speedsoftware.rootexplorer (Root Explorer)
com.srowen.bs.android (Barcode Scanner+)
com.teamviewer.teamviewer.market.mobile (TeamViewer)
com.tocaboca.tocalab (Toca Lab)
com.trueaxis.jetcarstunts (JetCar Stunts)
com.trueaxis.jetcarstuntslite (JetCar Stunts Lite)
com.tunnelbear.android (TunnelBear)
com.twentythreedivide.hsw (How Stuff Works)
com.twitter.android (Twitter)
com.watabou.pixeldungeon (Pixel Dungeon)
com.wordsmobile.musichero (Music Hero)
de.lotum.whatsinthefoto.us (4 Pics 1 Word)
fishnoodle.canabalt (Canabalt HD)
frank.tools.defaultinstalllocationchanger2 (Default Install Location)
jp.naver.line.android (LINE)
jp.naver.lineplay.android (LINE PLAY)
mobi.infolife.appbackup (App Backup & Restore)
net.asantee.magicportals (Magic Portals)
net.asantee.magicportalsfree (Magic Portals Free)
org.adaway (AdAway)
org.fdroid.fdroid (F-Droid)
org.mozilla.firefox (Mozilla Firefox)
org.zwanoo.android.speedtest (SpeedTest.net)
piuk.blockchain.android (Blockchain.info Client)
ru.zdevs.zarchiver (ZArchiver)
tv.twitch.android.viewer (Twitch)
uk.co.ashtonbrsc.android.intentintercept (Intent Intercept)
us.attak.qrsend (qrSend)

I'll try to add more icons as I continue to use the ROM (I just make the icons when I install an app and it doesn't look right to me).

How to use?

Use any file manager with root capabilities. (I use Root Explorer.)

Step 1:

Download icons_CoffeeCone.rX.zip and extract it to reveal "icons" file.

Step 2:

Move or copy "icons" to /system/media/theme/default/

(Optional: Backup your own "icons".)

Step 3:

Change permission of "icons" to rw-r--r--.

Step 4:

Go to /data/system/customized_icons/ and delete all the images there.

(NOTE: This is done so it will regenerate the icons on next reboot and will no longer include the ones that have custom icons, thus saving space.)

Step 5:

Reboot.

And that's about it! If you want to know how I made the icons, just send me a message or something. I don't know if this will be of use to anyone but I would just like to put this out there in case somebody looks for it.

DOWNLOAD IT HERE

icons_CoffeeCone_r1.zip

NOTICE:

If you want to get just select icons, then rename "icons" to "icons.zip" and extract it somewhere. The icons are inside /res/drawable-hdpi/.