(These are pre-formatted for RPG Maker VX, you may change the sizes/colour depth to use in the RM you are using. If you are new to VX and spriting, it is advised that you use the names that I give the files.)
computer.png
This is made to resemble the G5 Apple iMac.

!$computer.png
A generic flat-panel monitor with keyboard.

!$phone.png
Made to resemble the Apple iPhone.

!$television.png
Just a common television.

If you want to see them being used in a game, I have screenshots here:
http://www.rpgmakervxace.net/index.php? ... e-sprites/