hmm
i guess since ur talkin abt themes it must be a symbian phone ?
my knowledge abt ngages are very lil so im sorry if this doesnt help
www.symbianthemes.com <== free registration for forums !
there were 2 more ... ill look it up again !
but this one is good !! trust me
hope it helps
here are some more
*series60.freelinuxhost.com/
*s60games.hollosite.com/
*s60theme.hollosite.com/
it was posted in another thread i saw
these ofcourse apply if u have a series 60 phone
again my knowledge of ngage is very limited ... sorry