Hi tulipkoh,
sorry i haven't got any wedding collages, but photoshop lets you do practically everything that you might like. usually collaging would involve some play with texture, so you might want to try different textures. But mostly i'd think collages are really quite personal, just have fun making 'em!
http://dontfeedthellama.tripod.com/collage.html might give you some ideas.
And i like
"ME" Photoshop collages, uses alot of texture and depth.
The
tutorial on this url is very good.
I'll be very interested to see how your collage turns out =)