My dreams aren't consistent enough to make friends, sadly. u.u A few recurring characters but they have years of separation between visits, and I rarely recognize them in the dream-state.
I do have an imaginary landscape. (Mindscape?) Some of my friends have a hard time with their sort of half-existence, there and not there, touching the ground, but unable to touch it, hungry but unable to affect real food. For that reason I sometimes retreat with them back to a state of mind where we all have imaginary bodies in an imaginary world, a safe place inside myself where we can all interact on the same level.
For me it.... well it started as a giant, leafless tree on a blasted landscape. Strangely peaceful in a way, as if it were only sleeping not dead. I forget how it happened (wrote it down somewhere...) but my tree did eventually leaf out, and now it's at the edge of a rocky cliff overlooking the ocean, with a grassy plain landwards, one lonely tree contemplating the cliff's edge with nothing for miles around. We meet at the tree.