If the text is a part of the overall design then that is o.k. to a point, but believe me, most people will pass up on a wall with a prominent name and web address, they just don't want someone else's name on their system. We have even been known to moderate walls with web addresses on them as advertising.
And, if someone is going to rip your wall, they will do it regardless of whether you put a name on it or not. I wouldn't worry about that too much, copyright is inherent in all your work as soon as you upload it.
We're just trying to help you Martyn. (and I always try to help a fellow Brit )
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