Generally speaking, I find that the lavender AM is really the only one that truly works as an AM, because unlike the others, it wasn't often used for what would eventually become established characters. By that, I mean whenever I see a fat blue AM, I always associate that pattern with Mr. Johnson; whenever I see the golden yellow AM, I always associate that pattern with Guy Smiley; whenever I see the mini pink AMs, I always associate that pattern with Prairie Dawn.
I will say this though, the pumpkin AM looks particularly strange when it's used for female characters, especially little girls.