Mask Tutorial?

Hello again. I made a level generator for my WIP game, but I want it to look like a ancient cave. Currently, the Objects making the level are black squares, which I want to make seamless using a tiled background. How would I use "Mask" to achieve this?

TL;DR How do I make the black boxes appear as seamless using Mask and TLBG?

Here is an EXE (safe) of the level thing.

http://dl.dropbox.com/u/21499454/Games/labyrinth.exe

EDIT:

Controls

Arrow keys: move/jump

Shift+Arrow keys: Change gravity direction

A mask, as in a shader applied to your tiles via the tiled background would be very inefficient as you would would have to keep the tiles, and have the fx running all the time.

A better way would be to give the tiles their own seamless texture, and vary the look by changing the texture around corners. Something similar to this method:

http://www.saltgames.com/?p=184

A mask, as in a shader applied to your tiles via the tiled background would be very inefficient as you would would have to keep the tiles, and have the fx running all the time.

A better way would be to give the tiles their own seamless texture, and vary the look by changing the texture around corners. Something similar to this method:

http://www.saltgames.com/?p=184

I have a texture for it, but if I overlap it around the block, and have more than one block (which I do), it would not be seamless:

<img src="http://img607.imageshack.us/img607/4223/tiledbg.jpg">

If you mean generate its look upon loading, then that would really make it load longer, wouldn't it?

Anyways, I've decided to give it a silhouette look instead. The BG is still bricks, but the Walls and Player are black, shadowy figures.

Thanks for helping though.