What kind of collateral would be suitable
Something with a stable value, being easy to sell on case of default.
You can get some ideas from this post:
https://bitcointalk.org/index.php?topic=577765.msg6311902#msg6311902Also you should specify the interests you're willing to pay for that loan.
i mean i could offer my account but that would kind of suck cause then i wouldnt be able to really use the forum
Your account is in no way worth anything near 0.5 BTC.