I found it! It wasn't in Mon Tricot after all, but the 'McCalls Needlework Treasury.' And also it was a chart. And I am dumb so I don't know how to modify those charts from the net, so I tried to make my own in Paint, and it turned out really wonky, for which I am so sorry. It's marked out in 8x10 blocks but I can't get it to post large enough. Do you want me to send you the file? Then you could play around with it and stuff.
At any rate it was pretty fun to make (like a knitting crossword puzzle!) and I hope you can get some use out of it.