y'know chat i've gotten colored eggs from all types of summons before i Don't think the element of the summon influences which egg u get. i got a Green egg from an unaligned summon just now. tho... maybe it's like how you'll get things like silk ribbons from unaligned summons too but you'll just get extra ribbons from wind summons... cause i do get a lot of mainly green eggs from my wind summons...

note: main drop fur
...which it doesn't seem to drop from using the mirrors! huh
also doesn't drop furs from eating smiley salad. guess things like that require an actual user socialization
(if it's like that, is there any reason to give your pets a salad instead of just putting a mirror in their room?)
also, it seems that putting thief bags in a room with a pet that has special drops could be a bad idea if you want the pet's special drops. the item dropped by the bags seems to replace the special drop sometimes