Shower-inspired of the day

[tmanni]

Another approach using only filters: start from a small image where each pixels will become a tile, using noise filters to alter colors and a small bump mapping to give a bit of relief.
Thanks to Filters > Generic > GEGL graph, all can be done in one place:

Code:

id="main"
color value="#17F"
noise-cie-lch holdness=1 seed=0 lightness-distance=20 chroma-distance=10 hue-distance=3
scale-ratio x=40 y=40 sampler="nearest"
crop width=600 height=600
pixelize size-x=40 size-y=40 ratio-x=0.9 ratio-y=0.9 background="gray"
mean-curvature-blur
bump-map aux=[
color value="white"
crop width=600 height=600
pixelize size-x=40 size-y=40 ratio-x=0.9 ratio-y=0.9 background="gray"
mean-curvature-blur
gaussian-blur ]