Here's a great little box to use for ornaments, and you can make it with 8 1/2 x 11 paper:
Gallery at Splitcoaststampers
And here's the link to the pattern:
http://www.ustamp4fun.com/ProjectGallery/BoxCard.htm
And here's Qbee's great project using a smaller version of this same box, and in her description she has a link to a wonderful project sheet she made that illustrates making the regular size pattern:
Gallery at Splitcoaststampers
FYI, it's a very snug fit for a 2 1/2 inch glass ornament, so I adapted the pattern to be just a little larger to accommodate using some tissue paper by using an 8 1/2 x 8 1/2 inch square piece of cardstock and scoring at 2 3/4 all around for the bottom, and for the top I use a 5 1/4 x 5 1/4 inch square and score in at 1 inch all around. This makes the box 3 inches wide by 2 3/4 inches tall.
Hope that helps, and good luck.
Linda