Hello all,
On the chance that somebody would like a technical explanation of what's going on here, I thought I'd offer mine (for what it's worth).
The SameDayMusic ad is a small piece of javascript executed when the web page is displayed. And there appears to be (so far) three different variants of this javascript.
1.)
2.)
3.)
(notice the change of text in each sample)
Okay, the code starts off with establishing a table with a fixed width of 528 pixels. Then another table is nested inside the first table and a background image is chosen.
This image has a height of 124 pixels.  Then the text is added and as we can see above, some ads get more text than others. Since a fixed height of 124 pixels was used (height="124") rather than a varying height (height="100%"), the image has to "tile" itself to accommodate the extra text.
I don't believe this was intentional. To me, it's more of an "oops"...didn't see that coming, kind of a thing.
-mike