I have to agree with many of the previous posters on here who say favors usually end up in a drawer or the trash. I was reading this blog, Weddingbee, and someone posted this idea. I think it is a great way for your guests to have a voice in your donation, but not paying for favors that are going to end up in the trash. This is how I plan on doing my "favors."
Weddingbee: Sweet Charity
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ZTA
"Even in our sleep, pain which cannot forget, falls drop by drop upon our hearts. Until against our will comes the wisdom of God."