Okey, now first (what would Brian do 
):
1. Count how many patterns you have. With calculator find best count per line horizontaly and verticaly (kike 5x7 or 6x9).
2. Decide how big should be one pattern. I would still sugest those width 700px for total image so it's 2 in row. Or go for really big and put them all together in one image your choise.
2.a Make that final preview image how big you want.
3. Any way. Calculate how big one square will be by dividing total image width with pattern per line count.
4. Make such square image.
5. Makelayer do filling with pattern and flattern image.
6. Copy/paste it to final image. Positioning with move tool.
7. Go back to little square image and undo flattern.
8. Go to pattern overlay and choose next pattern. Flattern image.
9. Repeat 6-8 as many times as needed.
10. Save final project as tif (just in case). And Save for Web.
Post it with comments and separate patterns.
