I've also made some nifty paper wallets (though not as well designed as yours), but here's my problem with making well designed paper wallets:
If you're making it for yourself, what do you care about design/tamper-proof/etc?
If you're making it for others, why would they trust you that you didn't print another copy of the private key at home?
This is exactly the problem we are solving over at Open Paper Wallet.
We've designed wallets that follow a standard template, with lots of different designs. The graphics are pre-printed on high quality paper and shipped with security features.
However, the keys are self-printed at home
That way you get the best of both.
We're a couple of weeks from the first 5000 sheet production print run. See the project here:
https://bitcointalk.org/index.php?topic=155847.0;all