The Shape of the Waveless Sea: Ethereal Overview (GEP)

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Streamers of vapor emerge from nothingness. Swirling masses of mist-first blue, then aquamarine, then emerald swirled with crimson, all in continuous and ever-changing patterns-shroud a body's vision. Whorls of fog and shadowy shapes of varying solidIity float in and out of view. A few blobs of solid ether lazily sail end over end, some gaining density and others losing it.
Clear windows open onto scenes both familiar and alien before losing resolution in the slow, chaotic boil of the Ethereal Plane.
A blood on her first visit to the Ethereal finds herself immersed in varicolored fogs, or maybe she's bombarded by a soft "fall" of solid ether flakes, or perhaps she rests in an area that looks like a small town on a misty, fogbound evening. See, the Ethereal Plane resembles many things, but cutters most often liken it to an ocean. It has a shore (the Border Ethereal) and mysterious depths (the Deep Ethereal). When a body first crosses the boundary from the Prime onto the Ethereal, she's in the shallow end, standing in the surf where the ocean meets the shore. The land above the shore (the plane from whence the traveler came) is still somewhat visible to the traveler, because she's really on both planes simultaneously-though most Prime natives can't see Ethereal observers. If a blood has the courage, she can access the worlds of the Prime Material Plane as well as the Inner Planes from the Border Ethereal. 
When a traveler wants to leave the shore behind and move farther onto the Ethereal Plane, she can make for the Deep Ethereal (often simply called the Deep). Looking back at the shallows, she sees a vast curtain of colors not unlike the northern lights on some prime-material worlds (the curtain isn't visible to those still on the Border). Beyond this Wall of Color is the Deep, infinite in depth and containing within it as-yet-unrealized space and matter. See, if the Inner Planes hold all the elemental building blocks of the multiverse, the Deep Ethereal holds all the potentiality of the multiverse. "Existence Becoming" is what the Godsmen often call the Deep, but truth is, most cutters don't understand half of what those berks really mean.
The Deep offers wonders and sites almost beyond description-including the color curtain (or Wall of Color) that leads to unique demiplanes that float solely within the enfolding ethereal fogs-but a body's got to be a top-shelf blood if she wants to survive for long out here. Between roving magran and the awesome power of ether cyclones, the dangers in the Deep Ethereal can put a sod in the deadbook for sure.