Losnana, I want to do the same thing because I love it when you get finished knitting something, it's complete. I even stop along the way and weave in ends so that they won't be glaring at me when I think I'm done.
I have "The Knitter's Bible" by Claire Crompton. I went through and picked out about 10 different patterns I liked and then started seeing how they would look together by making dishcloths. That worked and I decided on the following: Fern Lace, Heart Squares, Bobble Circle, Block Quilting and Seed Stitch.
The next step was to make sure that the rows coincided with each other, ie... all had 12 rows except for Bobble Circle (18) and Seed Stitch, which was not a problem. I figured out that the Bobble pattern just didn't have to be repeated as often and it worked out.
Since I think that size 7 or 8 needles give me the best detail, I figured how wide and long I want the afghan to be and took the stitch multiples for each pattern, added them together, separated them with seed stitches and WHA LA!
Okay, now I have 3 sheets with a total of five patterns. I had a hard time jumping from sheet to sheet so I actually sat down and followed the pattern through, picking up the first row from each, then second and so on. I ended up with alot more sheets of paper but I can actually check them off with a pencil when I complete them..
It is very tedious, mentally and you will have to concentrate but it is possible. I have not completed the project but work on it when the husband and son are gone or I know I'll have several solitary hours. I want to give it to my Granddaughter one day and it has to be perfect for her.
Good luck and holler if I can help you in any way
I found this one in pattern files: http://www.craftyarncouncil.com/projects/april_knitproject.html