Data Vault apps with Unlock Pattern
I use a combination of keepassdroid, wavelauncher and clipstore, which allows me to access my password manager from any app without having to close it, and copy my password to the clipstore before returning to the app I was in. Sounds more complicated than it is!

Alternatively, many like lastpass for automatic password storage and entry.

But if you really want something gesture based, maybe biowallet along with it's separate biowallet browser might be of insterest. You can assign a signature, which is infinitely more secure than point to point gestures.