I HATE blanketing, so I don't typically clip my minis. Of course, when I was showing them, I did for that. I will clip foals, as they don't want to shed out before it's super hot (I'm in Arizona).
For my driving horses, to help keep them cool, but not need a blanket, I clip the underside of their neck, their belly, and their head (the head is so they look nicer and so the bridle fits better). You can see it on my husband's blue roan gelding.
As it gets warmer, I will sometimes clip ones we are driving if they need it (if it gets too hot, they're working enough they warrant it, esp if it's not cold enough to need a blanket...). I'll often do the clip I mentioned above (which I do with a 7 or 10 against the grain) and do the rest of their body in a longer blade with the grain. Leaves them a little more fluff in case it's cool. But I don't shave legs, as the hair helps protect against the brush etc in the desert where I often drive. You can see this on my chestnut gelding, photo taken at a Combined Driving Event.
Sorry, I know this was for before and after photos, which I can't share because I'm at work. Photobucket is blocked here, all I have access to is the photos on my website. Just wanted to share what I do, since that question of blade length and with or against was brought up
Oh yeah, I also leave ears, although sometimes I'll clean them up a little. I NEVER shave the inside of the ears, even when I was showing in A and R. I also NEVER razor the face. I think it looks terrible. JMO
I usually do the muzzle with a 30 when I was showing. Now that I'm not (well, not in A and R shows), I leave the muzzle/whiskers alone. They have a purpose