There are lock screen themes, activated by winterboard. You enter your yahoo weather location code in the HTML file and hey presto. Some themes started to experiment with GPS updated screens too. Head over to Modmyi web site.
I had a couple of windows phone 7 style lock screens in Dropbox but it appears I've deleted them. I'll have a rummage on my nas see if I've got any there for you to try.
Sent using sorcery and the magic interwebs