Oh, wow. Great minds think alike, huh?
That's quite a list, and I
love this thread, because it kind of embodies the love everyone here has for ponies. It all comes from the same place, and apparently, it goes to the same place, too!
Pirate ponies: dunno if I've seen enough to qualify as an "everyone," but I've seen a lot of pirate ponies. Never get tired of 'em.
Real horse coat colors/breeds: I might also add this to the list. I see a lot of it, and it's a natural thing to want to try, especially after spending a while doing really stylized and done-up ponies.
ETA:
Four seasons series: WHO DOES NOT LOVE THIS IDEA?
These are popular themes because they are all awesome ideas for a pony, and the funny (not so funny?) thing is that I will never, ever get tired of any of these, no matter how many I see. I could look at masquerade ponies literally all day and be so happy it's unbelievable. Peacock ponies? BRING 'EM. Got a cherry blossom pony? SHOW ME IT. Henna? HECK YEAH. Snow-themed Christmas ponies? NEVER OLD.
We revisit these ideas, pretty much all of us, 'cause we love looking those things, and we all want a little piece of that magic to pass through our hands. Look how many of these have been themes for swaps!
I've done five of the ones on that list:
Peacock
Henna
Last Unicorn
Flower (roses)
Holidays (Halloween, fixing to add Christmas to that list, just need to finish up Halloween pony #2)
Got the peacock and henna ones done on one pony, so that's a twofer.
And there are a whole lot more on there that I have vague or not so vague plans for. I don't think there's a single thing on that list that I wouldn't be happy to attempt. Awfully tempting to just print that list out and make it a goal to fill it eventually!