Least favorite lego color...

[Blue Moon Knight]

I like all the colors. They're very pretty. If you don't want them, send them to me! I'll pay for shipping.

[Count Blacktron]

The confusing color of minifigure Flesh in the licensed themes. I buy it, but it does not mix well.

[dyntar]

I'd have to say yellow is my least favourite. Apart from if its used on faces, hands and in moderation as highlights like flags and shields.
Yellow is one of the oldest colours but I've never used it to make a building.
Blue, green, red, white, black, grey, tan, brown can all work as a base colour for building or for landscapes but yellow just seems kind of out of place somehow.

[Napoleon]

Lime green and pink. I can't find one use for either, unless I wanted to build a Power Miner-themed dollhouse.

[Lewa Rocks]

I'm not too sure. You see I find all the colors useful somehow. But I see why some could be disliked. But I guess I'll say white because most of my "white" pieces are now yellowish.

[Funnyham]

Flesh.

I don't really mind the new grays, as i have just started seriously collecting and so have an equal amount of both, and they sort of do go together if in a wall.

[Thunedar]

The orange that came out with Agents and Power Miners. I use the parts from those to modify my Dwarf Army and the colors they used in those themes boggle my mind.

And of course the Power Miners lime green.

[Athos]

Guess I never chimed in on this one. Yay for digging up old threads...

I don't like any color that they haven't made sufficient bricks in to make a decent MOC. I'm thinking of the numerous pink and orange and blue shades. We only get one or two bricks in these colors along with some stupid useless elements.

I guess I don't dislike any color, I just dislike the piece selection in some of the more esoteric colors.

Steve

[puddleglum]

In contrast with others here, I loathe my old grey parts, and much prefer the newer shades. But I would probably feel differently if I had a massive collection of castle building parts in the old greys.

As for the current colors, I don't dislike any of them, but lime green would be my least favorite.

[Ye Olde Republic]

In contrast with others here, I loathe my old grey parts, and much prefer the newer shades. But I would probably feel differently if I had a massive collection of castle building parts in the old greys.

As for the current colors, I don't dislike any of them, but lime green would be my least favorite.

I feel the same on both counts there. I've been selling off my classic greys, except for what I need in my 'collector sets', quite systematically.
Lime doesn't even go into my sorting bins, it goes straight into it's own and maybe one day I'll auction it off as a batch. I'm none too fond of medium blue either.

[Shadowviking]

Feel free to give any excess lime or medium blue to me. I love the stuff.

I'm not a fan of the Bright Light Yellow or whatever it's called- the colour used for Willie and Elsa's hair in the Indiana Jones sets. Even so I think it looks decent in some situations.

[Count Blacktron]

I think there are some odd colors, but it comes down to parts available in that color for a monstrosity of shade. I would not care for 2000 1x4 light pink bricks, but on 1x1 flower plates or on a witches/wizards hat it is just fine. The color I have and have little or no use for? That would be the vanilla bricks from the Island Extreme sets. Not quite tan and definitely not yellow, and certainly not in any abundance of parts and bricks for me to get going on either a structure or accent accessory. Just bland... like vanilla.

[Reeper]

I don't like any printed beards on minifig heads that don't fit any hair color, such as the marketplace blacksmith. It bugs me.
When it comes to actual piece color? I guess purple...or sand blue? I don't know...I just like my beards and hair to match.

[Locksley]

White, because it gets yellow after some time and white parts are not that usefull when building a castle MOC.

[Foamrider]

And from the dry, crusted, god-forsaken grave of deceased threads, rises once again, a thread to terrorize and-

Anyways, I despise pearl gray. Looks cheap to me.