I wrote one in 5/4 just to see if I could. [Click for MIDI] I like it (sounds hymnish), but I'm not sure it's legally 5/4 or some mixture. (Comments probably best - and welcome - by PM so as not to muck up this thread.)
Which reminds me - is the hymn 'To Be a Pilgrim' in 5/4? Steeleye Span used the tune for 'Our Captain Cried All Hands'.