Daydreaming is a big part of BPD, as we like to escape in other realities to cope with the suffering one. I'd like to invite ourselves to spread our borderline creativity and share our inner worlds!   
Personally, I often just imagine a parallel universe where I succeeded what I failed here : a relationship, finding love, travelling a lot, finding peace...  
Sometimes I push the thing a little more far, like when I loveeee to imagine myself on a television show, talking about my inner demons and how I've been able to go through that and become a successful writer.  
Finally, I sometimes reach levels that can be fun and fucked-up. Like, for example, in this period of my life, I'm finding real comfort dreaming about the life of a pop star travelling through space (lol).

So, what are yours? Let's share!