Fun guestbook alternative idea - create a page for guests to fill out during the reception that will go into a book later - page includes places for guest's name & address, special thoughts, advice, and even a "self-portrait"!
Beautiful center pieces or just around the house- rocks, flower of your choice (maybe string it to a rock by the stem so it doesn't float) in a vase, fill with water, add small candle and voila-on the mantle?
DIY wedding facts (a) I kinda like this. you can have "her" on one side and "him" on the other. This is a good idea for guests who may not know one or the other very well. - I also like this for fun facts about each others family