That is not possible.like fancy font old london style graffiti style...
Really
We don't have access to system files, which has the benefit of much improved security and apps can't mess up mission critical things, but has the caveats of less freedom to screw around under-the-hood and do some cool things.
We do have via a hack,but modding is limited to tiles lock screen and startup and shutdown screens
Not for Lumia's we don't, and I think its OEM-level access.
We have a hack.You need just a dev unlocked phone.Just BING how to change start screen in LUMIA
No AFAIK we don't.
WP7? Yup, doesn't apply here though.
WP8? Only in Samsung's ATIV phones (and maybe Huawei's)
A Lumia jailbreak EXISTS but looks like it needs hardware hacking.
And binging that turned up nothing?