I realize this may make someone angry, but i have made bargello quilts...3 queen size ones which i used width of fabric strips...then i made a bargello jacket, table runner and 4 placemats '
USING FAT QUARTERS.
i found the fat quarters were a heck of alot easier to deal with than the 40" strips.
so, i say, if you have not done a bargello yet, and want to give it a try, USE THE FAT QUARTERS. it might not be big but it will teach you the technique with a better chance of success because they are easier to use. after you do a couple small ones you will be ready to dive into a large one with long strips. you could always plan a table runner first, but i think you could probably make a throw quilt, if you have enough fat quarters...it would take alot of them.
jump in and give it a try. :) and enjoy learning the process.