i've never liked any of the litecoin designs, except these:
http://anonymouse.org/cgi-bin/anon-www.cgi/http://img855.imageshack.us/img855/7818/ltc1.png
http://anonymouse.org/cgi-bin/anon-www.cgi/http://img441.imageshack.us/img441/752/ltc2u.png
they were released into the public domain by aspect, and were available at http://alpha.cryptotron.com/ltc-designs/original.html (dead site now)

i know there's an awful lot of detail on them (you might want to modify it if your mint cant realistically achieve that resolution) but IMO it's by far the best litecoin design - all the others are complete shit (atleast as far as physical coins go).