It would be great if you could set the frame as opaque, then overlay the various color schemes as transparent to some degree.It depends on the block if a transparent textures is rendered with transparency. When you put a transparent texture on a glass block, you will see it transparent. Put the same texture on a dirt block and it will be opaque.
A possible solution is to use item blocks. Item textures seem to be rendered with texture transparency always (->water filled barrel).
@P1eter, could you delete those ridiculous long image data posts, please.
@Wodleth I see what you mean, will work on it when I have time