A good horse is never a bad color... However, after conformation, personality, and atheleticism, I would still not have a grey horse... I'm with the rest. It would be heartbreaking to watch a colorful horse fade out like a well-worn pair of blue jeans...
Perlinos and cremellos are a necessary evil... <g> I too started out not liking the 'freaky blue eyes and pink skin' and would run as far as I could. But, I LOVE buckskins and know the only way to breed them true is to have cremello or perlino in your breeding program. That being said, I have the cutest little cremello stallion by LK Doctor Dream. Unfortunately, he has sticky stifle and will have to be gelded. I am now looking at the most beautiful cremello (think the Lone Ranger's Horse Silver) stallion. He looks like satin.
I also (usually) don't like sorrels, but I have a beautiful "Little Girl with a Red Dress On" sorrel Quarter Horse mare... Has but a small white star on her forehead. During the summer she gleams like a new copper penny.
Also don't particularly care for red roans, but love a dark blue roan with black points. Love blood bays - used to have a blood bay Arabian mare (El Paso granddaughter) that was gorgeous with a blaze and 3 white socks.
I normally don't like Appaloosas because I don't like their pink 'spottled' noses, (but recently found out that some owners are blackening the noses for the show ring)... The large horse Appaloosas I've been around have a few screws loose and have scrawny tails. But, I have a Pintaloosa stallion (with a crappy attitude that's going to get him gelded if he doesn't straighten out!) that is really very pretty and naturally doesn't have the pink nose and has a flowing white & black tail... Just the pink 'spottled' ahem, undercarriage.... He has four white socks and large white patches on his body with more of a 'blue roaning' on the dark areas. He's a son of Brewers Dynamo DreamMaker and a grandson of Bond Dynamo with Orion Light Vant Huttenest in his background as well... And Orion is a beautiful Appaloosa!
So, basically, as soon as you say "I don't like (insert color here)" along comes one that makes you salivate... There are no absolutes when it comes to horses or colors...
Kari