As devas experience the end of their lifespan, this is what takes place:
1) the celestial flowers begin to wilt; 2) the celestial apparel appears dingy; 3) perspiration begins to appear in the armpits; 4) the once glowing complexion turns dull; and 5) the feeling of pleasure turns to boredom.
Almost all the kama-devas above the first pleasure sphere (catumaharajika) have castles or "pleasure mansions" of their own, but many of them seem to require residency with other devas, then there are husbands, wives, and "children," along with servants and attendants. But no one is homeless. Sometimes devas who become married merge their castles together. Once you reach the Yama world, Tusita, Nimminarati and Paranimmitavasavatti, the castles can float. Also these worlds aren't shaped like earth, but are like discs, with centers that spread outward.
Life in each pleasure world is much brighter and pleasing than the lower, with grander castles, more refined beauty (in jewels, flowers, decorations), and generally everything is just more enjoyable. In Yama, beings only need to embrace one another to experience sex. Yama is the world of the care-free devas, who don't worry or quarrel as some inferior devas do. In Tusita, they hold hands for sexual bliss. Tusita is the world of the highly contented ones, who are incredibly joyous and their happy lives are filled with gaiety. Everyone here is pious, and kind, and not given to aversion. This is where future Buddhas reside, and there many bodhisattvas dwelling in Tusita. In Nimmin. they just smile at one another, and in Paranimmi the devas avoid looking into one another's eyes because it causes sexual bliss--so if they want to, they just make eye contact, and they have sexual bliss. In the celestial lokas, many of the devas acquire celestial vehicles according to their merit.
In catumaharajika, which is what the world above us
is called, things are mostly different. Because of the nature of accumulated merit in this sphere, there are many diverse beings. Birth can occur spontaneously as in all the other kamalokas, but it can also occur in the womb, in the moisture of water, or in eggs--just like lower births. There is also the possibility of being neither male nor female, in this celestial world.
There are four main cities, one for each continent, filled with tall crystal castles and beautiful flower ponds. Outside the cities there is a vast, mythical forest called "Himavanta" in some places. Where Tavatimsa is likened to "Olympus," the forest of catumaharijika is likened to the faery forest of the Faery Kingdom in Western mythology. According to some Buddhist sources, it is thought that long, long ago humans were "closer" to the celestial forest, but in time because of our increasing defilement, we were sundered from it. Really, this supports the mysterious "human origins" story from Abhidharma.
Magikal golden trees with golden lives grow in solitude throughout the celestial forest, growing beautiful flowers which become amazing fruit for short periods--and the devas compete for these fruits. Leaves that fall in the forest disappear and do not accumulate. Many miraculous and magikal animal-beings inhabit the forest, and these are devas. Some of the lower-class devas reside "parallel" to the earth, in other words with us.
These devas may reside just sort of wherever, or in trees or in mansion above tree, the earth, or in the air. Some devas look very ugly and displeasing, others do not. Some of them look like frightening or beautiful animals, others look like humans. Experience in this devaloka isn't that great, really. However, mostly they live for a very long time, and the maximum lifespan is over thousands of years.
Beyond Tavatimsa and Yama, in Nimmin. the devas have the ability to create whatever sense-objects they desire. In lower worlds, devas inherit their castle based on merit, but these devas can change their castle however they'd like. In paranimmi tavasavatti, the devas do not even have to create. They can freely behold and possess the other celestial creations, and have hundreds of attendants. Lesser devas do not have to do much, and reap the fruit of their past merit; these highest devas, however, really don't need to do anything at all, they have whatever they need or want simply by wish. That's why there is a being dwelling here who is called "Mara."
It's important to note that names given to devas are derived from several uses; how they became devas, based on their merits, their human name, the name they are recognized by according to their actions, or names given by humans who worship them. The rulers of each celestial devaloka differ from the inhabitants because of their greater lifespan, greater merit fruits, and greater powers. Each devaloka has one king, except for catumaharajika.
I hope I was able to shed some light for you about deva experience. I didn't go into the brahma beings.
A seed sleeps in soil.
It's cold and alone, hopeless.
Until it blooms above.