Well, sort of. I just finished a cowl called "Painterly Cowl" (paid pattern on Ravelry).
When I saw pictures of the finished projects of this cowl, I just knew I had to do it. Most of theirs looked like they were "painted"... Mine, well, sort of. Not quite what I was going for...but still pretty.
I was so excited to get this one off the needles. But when I did and put it on, I felt such major disappointment! No fault of the pattern - just not what I had in my mind's eye while knitting away faster and faster - trying to get to the bind off and put it on point! After blocking it, it looks much better (a bit wider) and I'm happier with it. If I do another one at some point, I will definitely make it wider while knitting - and then the blocking will bring it to the perfection point!
Do you ever do this? Knit something that you just see in your head is going to turn out a certain way and then your bubble bursts?