UPDATE: See here for the other two, and for all designer details, see here.
For comparison, here are those same books in their 1990s PE versions (save Lolita, which wasn't included in that set). I have to admit, I mostly prefer these to the newer versions.
Here are the two books yet to get covers in their 1990s versions:
And, finally, here are a few other 'Penguin Essentials' I especially loved the designs for (several of these books, like the Greenes, have since gone to other publishers, hence their absence this time around).
|This being Rita Mae Brown's Rubyfruit Jungle|
|Crappy scan, but it's Nin's Delta of Venus|