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Get the APK
Open the WinRar
Drag the apk into the WinRar
Find the "terrain.png" file,which is in the "assest" folder.
Open with PhotoShop,and edit what you want.Or just replace with a downloaded texture.
Go to the "mob" folder,and find the "char.png".Download a new skin,and replace it.
Download the SignApk(link in the description).
Open the "Singing.txt" file, and change the "mc.apk" to your apks name.
Then copy the whole text and paste into the cmd which can be found in the directory.
Press enter,and you are done.You should have an apk,which called "your-signed-apk.apk".Install it.