The new one, orange pen on black background, to me looks like a blacksmith hammer or a welding torch.

I would not associate it with writing at all.

2, 3, and 4 (from the left) look like they're for a notes app rather than DTP.

5 and 6 tell me what the app is for.

7 looks like an art app, not writing. I favour skeumorphism, but to work that needs to use metaphors people are familiar with, and pots of ink are something I know only from art stores.