This is the only thing I have DIYed for the wedding and it doesn't fit with a theme or anything else but I really wanted to do origami place names. We got a stamp from ebay with individual letters on and put in many hours making them, 85 in total.
It was actually a nice job to do with my OH. He insisted that we do them together, aww.
The tricky part was stamping the names, if the letters get too jaunty they look like a psychopath has done them!