How do I make pictures look larger on the iOS 7.1 on incoming calls
The home screen and lock screen can be set to any picture in your Pictures library. Change them in the settings menu.
You can change the lock screen to anything in Settings. To change the way the lock button works, you will have to jailbreak your iPad and void your warranty.
The iPad does not have a Background Colour. You can choose a Photo for your iPad Home Screen and Lock Screen!
To take a picture on the Ipad 3 and indeed on the ipod touch you can take a photo of the screen by pressing the home button and the lock/unlock button at the same time. The picture will then save to your camera roll.
No
You can use many different drawing apps on the iPad to create lock screens and home screen backgrounds. The iPad doesnt' really have a 'profile picture' in the same way that Windows or Mac OSX does. Search iTunes for drawing or graphics apps.
There is a lock screen which has a slide lock at the bottom. This will give way to a passcode entry, if one is set.
you can't, I'm sorry
The iPad itself is just a tablet, you don't 'open' it, although it may be in a case or cover that hinges open. Press the Home Button, and the lock screen pops up. Slide your finger across the Slide to Unlock area, and it will go to the home screen. If it asks for a Passcode, enter the 4-digit lock code to open it. If you don't know what the lock code is, you'll need to ask the person who owns the iPad.
If you are speaking of orientation lock, the mute/orientation slider on the right hand side next to the volume control will lock/unlock the screen orientation.
You don't need an app for that. In settings, you can set a Passcode, a 4-number code needed to open the iPad. You can also set the auto lock time, so that the iPad will lock automatically after a period of inactivity. You can also purchase a polarized privacy screen protector that will limit the angle that you can view the screen at, so someone sitting next to you (such as on a bus or plane) can't see your screen.
On the right hand side of the phone on the side, there is a camera and lock button. Press the top one, with the picture of the padlock on to lock it.