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The best way to convert your pre-made layouts is to use them as a piece of your page. It is a little more difficult to convert them to the 8 1/2 x 11 size. The best solution would be to use a 12 x 12 size. With a 12 x 12 page you can use 2 of your 6 x 6 layouts and add two more squares make it a 4-square layout and using the spaces for pictures and/or embellishments and journaling.
If you must use the 8 1/2 x 11 size your can affix your 6 x 6 layout and work around it by adding more photo mats or some journaling pieces.
I need to warn you that the 8 1/2 x 11 size is becoming almost obsolete in the scrapbooking industry and particular size of paper is getting harder to find. The 12 x 12 size has become standard. Other sizes that are getting more popular are the 6 x 6, 8 x 8 and 9 x 9 album/paper sizes.