maybe one of these sites will help:
http://straw.com/equilters/library/q...bed_sizes.html
http://www.quilterscache.com/StartQu...iltingtwo.html
if you are just doing iron on transfers, you could either piece the top with a simple block, then do the transfer. You could just cut squares the size you need to balance the size of the prints, and to fancy it up a bit, you could do sashing between the blocks, or to simplify - just sew one block next to another.
Or make it all one piece of fabric, and do your prints. They have fabric for backings that is 108" wide.
And here is a link to making pillow cases:
http://www.craftandfabriclinks.com/p...ses/cases.html
Good luck! Have a great day! Be sure to show us pics when you get it done!