How do I choose a custom texture?

I can fill a rectangle with the pallet/textures provided, but how do I choose a JPEG to fill it with?

Say, I found a marble texture online, saved it, then wanted to fill the rectangle with that texture.

Hopefully that made sense..?

Last edited by Blast For Satan at Nov 9, 2008,
I don't have Illustrator but I imagine you would take the picture and save it as a texture file in the Textures folder or whatnot.
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