Applying texture to auto-tile tiles

Hey all,
So, I've made an automatic tiling system, and I use 16 frames for each tile to represent different configurations. But, everytime I want to change a tile's texture, I have to draw 16 versions of it, which is very time-consuming. Is there a way to dynamically apply the texture during runtime? For example, I have some blank tiles like this:
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And I have the texture:
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It will apply the texture on grey parts, like this:
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This is optional, but is there a way to apply a bigger texture than the tile itself, like this:
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Any help would be greatly appreciated.

I've look through the "Help" menu, apparently it seems to load entire images, not in specific parts. But I think the "Surface" object can do this. I'll mess around with it for a while to see if it's possible.

I've come up with a rather crude method, which is pasting pixel by pixel. It works quite well with lower number of objects, but there is one problem. This is the example: Please login to see this attachment.
- If you disable the Tile loop, then pressing Space would paste the texture.
- If the Tile loop is not disabled, the pasting wouldn't work.
Can you guys look into it and fix it?