Texture color within jit.gl.multiple

Greetings, oh you Jitter gurus.

I am busy building a patch in which one can paint with "brushes"

So I took a jit.gl.gridshape and a jit.gl.multiple assigning different textures to each of the "gridshape - multiples"

The textures are *.png with transparency enabled. Which is working fine.
But the plane generated with gridshape (even with blend_enable 1, alpha 0 and depth_enable 0) keeps showing.

Not if I give it the color 0 0 0 1 and select the correct blending mode.
But as soon as I change the color to anything else than black (still fully transparent) I keep seeing the plane .. not only the texture itself.

What I would like to do, is to give every texture within gl.multiple a different color. Is that possible without changing/colouring the texture itself? And Is it possible to completely get rid of that plane? Seeing only the texture?

If somone could give me a hint: That would be great!

Thanks a bunch!

P.S: I also thought of generating the multiple objects with jit.gl.mesh which would me give alot more freedom I think. But I assume that this approach is somewhat more gpu-friendly? (Because I don't have to redraw a long "list" of commandos every frame?)