If it is something I REALLY like, I will make a sample block and attach a note with whatever other info is needed. That block gets put on a separate design wall as a reminder.
But I also have about a dozen pieces of paper beside my computer, with patterns drawn out, or pattern names and notations. They are my 'thinking about it' file. I just need about 5 more quilting hours in my day--which would eliminate housekeeping and cooking. Works for me!!