I did this, and it's been up on my porch for about two years, through Wisconsin winters and summers. It's faded a bit, but not too bad. I used the fabrics that I didn't want to use for "real" quilts - some poly blends, dated small-scale calicos, etc. The poly blends actually work quite well, because they don't fade as quickly. I think I used an old mattress pad for the batting and some ugly remnant on the back. It's not going to be an heirloom. I didn't even expect it to last this long. I was digging through boxes of fabrics last night, looking for something new. I got lots of rave reviews from the neighbors at first, but they are probably tired of looking at that one. Time to make a fresh one!