using auto stitches and complementary colours.they highlight each other so make for a fairly bold layering. More stitching as in the red and green sample seems to “muddy” the colours, as you would expect with two complementary colours.
The blue and green, beside each other on the colour wheel, work much more harmoniously.
I prefer the sample stitched on a coloured background, the blue/green combination with just a touch of red, emphasises the texture rather than the colour being all-dominant, and I can see this piece as a background for further layering of hand stitch and/or beading.
The scribbled “anything goes” stitching piece is a bit of a hodge podge! but might work ok with some sheers layered over it, so that the bold effect can show through and be toned down.