Hi Ray,
Off to a flying start with these
Week 1 : Selective colouring isn't my favourite technique either (as a lot of people have said) but at first glance I really didn't register that your first shot was selective colour - so it must have worked well

It just felt like a very natural, normal way of looking at the image.
Week 2 : Unique and interesting interpretation of new. Again most of it has already been said, but I really do like the 3D effect that you've got into it. Well done with the reflections too.
Week 3 : And finally style. Another great take on the theme, but I can see what you mean about it not quite being there yet.
You've got a good point with the lighting - something slightly less uniform and from the side may have given it more impact. If you can't take your flash off-camera, take a desk lamp on an extension cable into the bathroom. With static subjects shutter speed isn't an issue so you don't need a particularly bright or intense light to get the correct exposure.
I also think you were right to include the tap - it's needed to give it some context, although right now it's pulling my eye away from the gel slightly.
Perhaps slightly more DoF would help. I don't think that the tap would intrude so much if it was a little sharper and it would be nice to see some of the tile detail in the b/g too.
p.s. @15p for a prop . . . absolute bargain !!!