The phrase
"colourful sponges" refers to sponges that are vibrant and have different colors.
Full definition
Shower or Bath Clean
With Colourful Sponges» My daughter would also happily scrub the (bottom half) of the shower glass as long as she got to be in there naked playing with colorful sponges while she did it.
Every inch of the structure is encrusted
in colourful sponges or adorned with hard or soft corals and featherstars.
See: Shoals of flagtails, strepies, and the odd blacktail, convict surgeon, spot damsels, coral,
colourful sponges, and anemones.
The amazing sights of coral reefs,
colourful sponges, vibrant tropical reef fish and a whole range of other reef creatures will reveal themselves before your very eyes!
The walls are adorned with lots of enormous Gorgonian fans and
colourful sponges and soft corals.