You can use your site address as an open id.
For this
1. Visit myid.net
2. Create a profile
3. You will get an OpenID url like yourname.myid.net
4. Go to tips and tricks after log in - yourname.myid.net/help/tips
5. There you can see the steps to do. or it is here
<link rel="openid.server" href="http://server.myid.net/server" />
<link rel="openid.delegate" href="http://yourname.myid.net/" />
<meta http-equiv="X-XRDS-Location" content="http://yourname.myid.net/xrds" />
paste these three lines in your sites home page, or the url u want to use (DONT FORGET TO REPLACE THET YOURNAME)
that's all, you can use that url as your openID
OR
if your using claimID you can check this link