If anyone wants an invite from me, just message me your email addy and I'll send you an invite. There's a bit of a hierarchy in that it takes longer to get on Pinterest if you request directly from Pinterest, but you can get on there a lot faster if you get an invite from someone already on there.
Not sure how long Pinspire is gonna last, since they totally ripped off their site from Pinterest...but we'll see. I'm not interested in being on yet another site though and I've been on Pinterest for a year now..so I'll stick with it, Facebook, Mothering, and one other forum (plus a few blogs) as the extent of my online life!! 
My boards can be found at http://www.pinterest.com/RaineyDaye/
They aren't very minimalist though!! I figure that's fine though...better to collect pictures online than junk in my house, right?