I personally think the minimal versions in #3 and #4 are improvements over the original, but I think it’s still too difficult to tell what I’m looking at. On the other hand, with #2 it’s pretty clear that I’m looking at a small Peercoin leaf. #2 is visually clear and recognizable, where the others are too small and harder to see. We have also used this leaf on all Peercoin related marketing and branding, in all logos: Peercoin, Peerunity, Peershares & Peerbox, also on Reddit, Facebook, Twitter and our website.
In addition to the P, the leaf symbol also represents Peercoin, therefore I’m voting for #2.
A quick source edit attempt with crypto_coiner’s suggestion rendered me this, https://imgur.com/lHialWD.png
but would probably look better made smaller properly in a picture editor. I see potential in the idea anyhow. Edit: Sentinelrv’s argument about brand confusion seems sound though.