with 50,000btc house
Who can do it?
What does that mean? You site has 50,000 BTC wagered or Your site has 50,000 BTC as bankroll?
you can open contest
so many people can design signature for you
but if you account if newbie, you must use escrow if open contest, without escrow many people not interest
Signature contest is a nice idea, but that will costs OP more than hired a person who can designed for him. Ussually in the contest, there are a second and third winner.
It would be better if you hire someone experienced in creating these kinds of things. Try out SFR10, he runs a good signature creation thread on the forum; I'm just not sure where it is, though.
Here you go
https://bitcointalk.org/index.php?topic=1136108.0