Definitely agree with the comments about asking them what they want . . . like any other wedding what they want will depend on the couple's personalities.
I'm friends with two male gay couples and their civil ceremonies were like chalk and cheese.
The first was a very formal, conservative affair - morning suits, traditional bridesmaids etc etc.
The second was completely OTT and as camp as anything. Matching suits - one in pale pink and one in baby blue. Dave even had a garter on under his suit and one of the shots they requested was him in the traditional bridal pose, trouser leg rolled up to show the garter

(Done as a fun memory of the day and not to be taken too seriously - although it did make the album!)
I can't suggest anything from a photographer's perspective, but the point I'm trying to make is that the shots and poses from each of these ceremonies were totally different - you'll have no idea of what they want unless you ask them.
The one thing that I noticed from both of them though was that the photos that I liked best were the ones where there was strong eye contact between them. IMO It was that visible connection and emotion between them that made them look like more than just friends at somebody else's wedding.