While the other cover for Orwell’s Decline of the English Murder discussed in this post at Zoo in the head is probably superior, I do like the Penguin placement here:

Decline of the English Murder and other essays by George Orwell

I think they did the same with other Orwells at the same time. For a more contemporary example, currently Penguin have an imprint just for James Bond titles, the logo for which is:

Penguin 007: the logo for Penguin's James Bond imprint. This photo is of the hardback Quantum of Solace, designed by Pentagram.

Penguin 007 logo. Pictured on the Pentagram-designed Quantum of Solace hardback.

But there must be other examples like this?