Hey!

On my way to find an artstyle I'm not too untalented for I found this stuff here and I REALLY like it. But now to my problem... how could I do this? I thought about setting a kind of a triangle grid and just fill them, but I didn't find a way to achieve this with GIMP or PS. Then I just created a few triangles and arranged them, copied the whole thing and filled the whole image with it so that I have a pseudo-grid to fill (like this), but that didn't work too great either. So... does anyone have an idea how I could do this without having to create every single triangle and arrange it to my final image?

Thanks in advance and sorry for my... german english :)