Re: Criticize my tamper-proof paper wallet design... and steal 0.1 BTC if you can.
If you're making it for yourself, what do you care about design/tamper-proof/etc?
It doesn't offer much in terms of security - if someone did find your bill they'd probably just take the whole bill with them and sweep the address quickly, leaving neither evidence nor much to do about it.
But the tamper proof tape does offer peace of mind. It's the knowledge that if you did get robbed you'd know it at once, and not discover it much later when you perform a routine check of you balance.
It's not just for myself -- once the design is reviewed/revised, it will be available as a clientside javascript wallet generator based on the code from bitaddress.org. The idea is just to incrementally improve on the paper wallet generator already there, especially for people who want to do things like give their family members and friends a more attractive and idiot-proof wallet. Also I think a wallet should look valuable so that if I die, someone stumbling on my belongings will think, "Oh, this looks valuable. Maybe we should keep it!"
I like the design - well done.
If I'm not mistaken, inkjet printer ink can fade relatively quickly (a couple of years?). I am not sure about laser printers.
If I were you I would put some warnings up when using the software to that effect.