I liked this one from Photojojo ; https://litmus.com/scope/ykgc55yoe3bg from the subjectline to the hero image, it is silly and caught my eye.
or this one from zippypixels ; https://litmus.com/scope/odpxeozxhh1z and
https://litmus.com/scope/drtzh63rol2f nice use of color.
The best one however, is this one ; https://litmus.com/scope/xhon5octu9ac
Expected to receive lots of mails with countdown timers, however didn't see any !
your url seems to be wrong.
and then it works