For longer blond wigs I have Rose, and the one I used for Jenny (also in this icon), you can see it can be worn differently:
http://www.cosplay.com/costume/48139/

I'm not sure yet whether I'll be bringing Jenny to Gallifrey, but probably not so it should be available that weekend.

Also you might want to ping 1ucifer 'cause I think she bought a new wig for Lucy