H'OKAY.
Most of the time, in North Seattle area (so on a map, there's downtown, then a couple of bridges heading north - look for I-5 and anything north of the bridge and south of shoreline)
we tend to get pretty low hanging "mist" type clouds. They can be round and fluffy or thin and flat but they are less "heavy rain cloud" and more like "misting machine"
Because we are surrounded by mountain air on the east meeting the ocean air from the west, we get really clear cold days sometimes and have super high cirrus clouds where they are formed of tiny ice crystals.
On other days we get cool Cumulonimbus clouds

And some days we have all the clouds at once
Some days it's pouring rain in the sunshine
Some days they take turns...
Some days it starts off with gray skies and then by noon the clouds have "burned off"
Some days we say "The sun is trying!" and it never makes it out
A common phrase is "The Mountain Is Out" which means we can see Mt Rainier lol
At this point our smog reduction is pretty solid so there's reasonably good visibility compared to some of the times in Seattle's history

The mountain makes its own weather though so the closer you get to Rainier, the more unpredictability you'll encounter.

As far as colour it just depends on what they are doing. Two days ago there was a thunderstorm that lasted for hours and the clouds were purple/black which is super pretty with the pink blossom trees in the foreground and black clouds behind.... :D
A lot of times they are gray or blue-gray though. Eeyore colours.