I have designed a simple map which is stored in an array, 0's represent corridors (empty space) and 1 is a wall.  The player can face 4 directions, North, East, South and West.  I am checking the player's X and Y position and their direction and drawing wall sprites from furthest away to nearest.  Pressing left arrow and right arrow on the keyboard rotates the player 90 degrees and up moves forward.  I have also put collision detection in, so you can't walk through walls.

I downloaded an Android app called Spectrum Eyes which takes photos and produces an 8-bit render of the image.  This will be useful for monsters and items however I don't think I will be able to use it for all items.  But I like the output, especially the skulls so maybe these will be one of the monsters.