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Amphibian's skin have an epidermis and a thick dermis. The epidermis is also known as the surface tissue and is serveral layers thick. The dermis layer is this and contains mucous, poison glans, and pigment cells. The skin is smooth, moist, highly vascular, and is used as a main respiratory organ.
The coloration of amphibians can be very colorful or very dull. Many of the species are brown or gray, however, poisonous amphibians tend to have more coloration. This can include having streaks, bright spots, or blotches.




Sources:

"Caudata ." Encyclopædia Britannica. Encyclopædia Britannica Online School Edition. Encyclopædia Britannica, 2010. Web. 27 May 2010 <http://school.eb.com/eb/article-40572>.