I like Kneipp herbal bath products. They feel great and smell great, bubble very little at first and settle down into little swirly patterns that float around on the water and make me daydream like I'm watching clouds go by.

The lavender is is my current favorite, but hops is nice, and so is melissa, and several others. They market some as 'relaxing' and some as 'invigorating' etc. but I just pick whatever smells best to me at the moment.

And don't worry, even though the colors are surprisingly bright, they won't turn your tub bright blue or orange. (Although if they did, it would look great with the stains from the purple hair color!)